Vista RTD

Vista RTD
This container holds Analysis data for an instance of Vista RTD.

Methods

CreateBladeDesign

This command class creates a new BladeGen model. An up-to-date BladeGen cell appears on the project schematic containing the new model.

Return Container representing the BladeGen cell.
Type DataContainerReference

CreateGeometry

This command class creates a new BladeEditor model. An up-to-date Geometry cell appears on the project schematic containing the new model.

Return Container representing the Geometry cell.
Type DataContainerReference

CreateThroughflow

This command class creates a new throughflow system. The system, comprising Geometry, Setup, Solution and Results cells, is created on the project schematic and is updated performing the throughflow analysis automatically.

Optional Arguments

UseBladegen    Indicates whether to use a Bladegen cell or a BladeEditor(Geometry) cell
    Type     bool
    Default Value    False

Edit

This command class launches the Vista popup GUI.

GetVistaRTDBladeDesignProperties

This query takes a container reference and returns the Data Entity which contains user settings and properties for the VistaRTD Blade Design container.

Return Reference to the requested Data Entity
Type DataReference

ImportBladeGen

This command imports Vista data into the Blade Design cell from an existing BladeGen file. If no appropriate Vista data is found in the specified BladeGen file, an error message is generated.

    template1 = GetTemplate(TemplateName="VistaCPD")
    system1 = template1.CreateSystem()
    bladeDesign1 = system1.GetContainer(ComponentName="Blade Design")
    bladeDesign1.Import(FilePath="myfilepath/pump.bgd")

Required Arguments

FileName Name, and path, of the BladeGen file to be imported.
Type string

Data Entities

VistaRTDBladeDesign

This data entity provides access to the properties which define the VistaRTD project. This includes both the input and the results properties.

Properties

AFR

This property specifies the air/fuel ratio of the working fluid. This is only available when using the AFR option for GasProps.

Type float
Read Only No

Alpha2

This property reports the absolute flow angle at the impeller inlet.

Type Quantity
Read Only Yes

Alpha2User

This property specifies the absolute flow angle at the impeller leading edge. Note that this is not available when the InletOption is set to 'Calculated'.

Type Quantity
Read Only No

Alpha3

This property reports the absolute flow angle at the impeller exit station.

Type Quantity
Read Only Yes

Alpha3User

This property specifies the absolute flow angle at the impeller trailing edge.

Type Quantity
Read Only No

Beta2

This property reports the relative flow angle at the impeller inlet.

Type Quantity
Read Only Yes

Beta2User

This property specifies the relative flow angle at the impeller leading edge. Note that this is not available when the InletOption is set to 'Calculated'.

Type Quantity
Read Only No

Beta3

This property reports the meanline section relative flow angle at the impeller exit station.

Type Quantity
Read Only Yes

Beta3hub

This property reports the hub section relative flow angle at the impeller exit station.

Type Quantity
Read Only Yes

Beta3shroud

This property reports the shroud section relative flow angle at the impeller exit station.

Type Quantity
Read Only Yes

Beta3User

This property specifies the relative flow angle at the impeller trailing edge.

Type Quantity
Read Only No

BMunitsOption

This property specifies the units used when creating a new BladeGen/BladeEditor model. Note that this is independent of the units used in the VistaRTD popup GUI.

Available options:

inches

Type BMunitsType
Read Only No

ClearanceOption

This property specifies impeller tip clearance is specified. 'Ratio' indicates that the tip clearance is specified as a fraction of the tip width 'User' specifies that the clearance will be defined directly by the user.

Available options:

Ratio

User

Type ClearanceType
Read Only No

ClearLoss

This property reports the proportion of energy loss attributed to the clearances between rotating and stationary components. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Type float
Read Only Yes

ClearRatioUser

This property specifies the ratio of the impeller tip clearance to the tip width. Note that this is only available when ClearanceOption is set to 'Ratio'.

Type float
Read Only No

ClearUser

This property specifies the value of the impeller tip clearance. Note that this is only available when ClearanceOption is set to 'User'.

Type Quantity
Read Only No

CorrelationOption

This property specifies the correlation used to calculate the stage efficiency. Note that this is only available when the EtaOption is set to 'Correlation'.

Available options:

Suhrmann

Baines

Type EtaCorrelType
Read Only No

CpMean

This property reports the average specific heat capacity at constant pressure for the turbine stage.

Type Quantity
Read Only Yes

CpUser

This property specifies the specific heat capacity at constant pressure, Cp, of the working fluid. This is only available when using the Fixed option for GasProps.

Type Quantity
Read Only No

D2

This property reports the impeller inlet diameter.

Type Quantity
Read Only Yes

D3hub

This property reports the impeller exit hub diameter.

Type Quantity
Read Only Yes

D3shroud

This property reports the impeller exit shroud diameter.

Type Quantity
Read Only Yes

DiameterRatio

This property reports the ratio of the impeller inlet diameter to the meanline exit diameter.

Type float
Read Only Yes

DisplayText

The general property that defines the user-visible name of an entity. This property is defined for all data entities but is used only in those entities that present a label in the user interface.

Type string
Read Only No

EtaImpTS

This property reports the total-to-static impeller efficiency.

Type float
Read Only Yes

EtaImpTT

This property reports the total-to-total impeller efficiency.

Type float
Read Only Yes

EtaNozzle

This property specifies the value of the total-to-static nozzle efficiency. The term 'nozzle' here refers to the geometry upstream of the impeller used to control the inlet flow angle. This may be either bladed or unbladed, eg. a volute. A specified nozzle efficiency of 1.0 implies no pressure loss across the nozzle and consequently the nozzle is neglected from the calculation.

Type float
Read Only No

EtaOption

This property specifies whether to use a correlation to automatically calculate the turbine stage efficiency, or to use a user-defined efficiency.

Available options:

User

Correlation

    template1 = GetTemplate(TemplateName="VistaRTD")
    system1 = template1.CreateSystem()
    bladeDesign1 = system1.GetContainer(ComponentName="Blade Design")
    vistaRTDProperties1 = bladeDesign1.GetVistaRTDBladeDesignProperties()
    vistaRTDProperties1.EtaOption = "Correlation"

Type EtaType
Read Only No

EtaStageTS

This property reports the total-to-static stage efficiency.

Type float
Read Only Yes

EtaStageTT

This property reports the total-to-total stage efficiency.

Type float
Read Only Yes

EtaUser

This property specifies the value of the total-to-total turbine stage efficiency. Note that this entry is only available when the EtaOption is set to 'User'.

Type float
Read Only No

ExitAngle

This property specifies the flow angle at the impeller exit. This will either be an absolute or relative value depending on the 'ExitOption'.

Type Quantity
Read Only No

ExitLoss

This property reports the proportion of energy loss attributed to the exhaust. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Type float
Read Only Yes

ExitOption

This property specifies the ExitAngle type.

Available options:

Absolute

Relative

Type ExitAngleType
Read Only No

ExpRatio

This property specifies the design point total-to-total expansion ratio, P01/P03, for the turbine stage.

Type float
Read Only No

ExpRatioTs

This property reports the total to static expansion ratio for the turbine stage (P01/P3).

Type float
Read Only Yes

FricLoss

This property reports the proportion of energy loss attributed to friction. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Type float
Read Only Yes

GammaMean

This property reports the average ratio of specific heats (gamma) for the turbine stage.

Type float
Read Only Yes

GasProps

This property specifies the method used to calculate the properties of the working fluid.

Available options:

Air

AFR

Fixed

    template1 = GetTemplate(TemplateName="VistaRTD")
    system1 = template1.CreateSystem()
    bladeDesign1 = system1.GetContainer(ComponentName="Blade Design")
    vistaRTDProperties1 = bladeDesign1.GetVistaRTDBladeDesignProperties()
    vistaRTDProperties1.GasProps = "AFR"

Type GasPropType
Read Only No

HubRatio

This property specifies the ratio of the impeller exit radius at the hub to the impeller inlet radius (tip radius). This enables the hub exit radius to be controlled in a non-dimensional way.

Type float
Read Only No

ImpellerLength

This property reports the ratio of the impeller axial length to the impeller tip diameter.

Type float
Read Only Yes

ImpellerLengthOption

This property specifies whether the impeller length ratio is calculated automatically, or specified by the user.

Available options:

Automatic

User

Type ImpellerLengthType
Read Only No

ImpellerLengthUser

This property specifies the ratio of the impeller axial length to the impeller tip diameter. This enables the impeller axial length to be controlled in a non-dimensional way.

Type float
Read Only No

ImpellerLengthUserOpt

This property specifies whether the impeller axial length ratio will be defined by the user.

Type bool
Read Only No

ImpellerNumber

This property specifies the number of impeller vanes.

Type int
Read Only No

ImpellerThickness

This property specifies the average vane thickesses at the impeller exit.

Type Quantity
Read Only No

IncLoss

This property reports the proportion of energy loss attributed to the incidence at the leading edge. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Type float
Read Only Yes

InletAngle

OBSOLETE PROPERTY RETAINED FOR BACKWARDS COMPATIBILITY IN THE POST MIGRATION STEP

This property specifies the flow angle at the impeller inlet. This will either be specified as an absolute or relative value depending on the 'InletOption'.

Type Quantity
Read Only No

InletOption

This property specifies the InletAngle type.

Available options:

Absolute

Relative

Calculated. ****** OBSOLETE OPTION PLEASE USE ABSOLUTE OR RELATIVE ********

Type InletAngleType
Read Only No

Loading

This property reports the basic loading for the turbine stage (delH/U^2).

Type float
Read Only Yes

LoadLoss

This property reports the proportion of energy loss attributed to loading. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Type float
Read Only Yes

Mach2

This property reports the absolute Mach number at the impeller inlet.

Type float
Read Only Yes

Mach3rms

This property reports the meanline section absolute Mach number at the impeller exit station.

Type float
Read Only Yes

MachRel2

This property reports the relative Mach number at the impeller inlet.

Type float
Read Only Yes

MachRel3shroud

This property reports the shroud section relative Mach number at the impeller exit station.

Type float
Read Only Yes

MassFlow

This property specifies the design point mass flow rate passing through the turbine stage.

Type Quantity
Read Only No

MrootToverP

This property reports the characteristic flow function for the design point (M x SQRT(T) / P).

Type float
Read Only Yes

NozChkRatio

This property reports the choke ratio for the nozzle.

Type float
Read Only Yes

NozExitDiameter

This property reports the nozzle exit diameter.

Type Quantity
Read Only Yes

NozThtArea

This property reports the throat area of the nozzle.

Type Quantity
Read Only Yes

NozVlessRatio

This property reports the ratio of the 'vaneless' nozzle area to the impeller inlet radius. Note that the nozzle area used here neglects the vane thickness, hence the 'vaneless' prefix.

Type Quantity
Read Only Yes

Ns

This property reports the specific speed of the impeller.

Type float
Read Only Yes

Omega

This property specifies the design point rotational speed of the impeller.

Type Quantity
Read Only No

OvrChkRatio

This property reports the overall choke ratio (mass flow/choke flow) for the turbine stage.

Type float
Read Only Yes

P02

This property reports the total pressure at impeller inlet.

Type Quantity
Read Only Yes

P03

This property reports the total pressure at impeller exit.

Type Quantity
Read Only Yes

P2

This property reports the static pressure at impeller inlet.

Type Quantity
Read Only Yes

P3

This property reports the static pressure at impeller exit.

Type Quantity
Read Only Yes

Power

This property reports the aerodynamic power generated by the turbine, neglecting mechanical losses.

Type Quantity
Read Only Yes

Reaction

This property reports the degree of reaction for the turbine stage, (T2 - T3)/(T01 - T03).

Type float
Read Only Yes

RelVelRatShroud

This property reports the ratio of the impeller exit relative velocity at the shroud (W3shr) to the impeller inlet relative velocity (W2).

Type float
Read Only Yes

RUser

This property specifies the specific gas constant, R, of the working fluid. This is only available when using the Fixed option for GasProps.

Type Quantity
Read Only No

ShroudRatio

This property specifies the ratio of the impeller exit radius at the shroud to the impeller inlet radius (tip radius). This enables the shroud exit radius to be controlled in a non-dimensional way.

Type float
Read Only No

SpanwiseDistributionOption

This property specifies the spanwise distribution used when exporting the impeller blade.

Available options:

General

Radial

Type SpanwiseDistributionType
Read Only No

SpeedRatio

This property specifies the blade speed ratio, U2/C0, of the impeller, where U2 is the impeller tip speed and C0 is the spouting velocity. In this definition the spouting velocity is calculated from the total-to-total isentropic temperature drop.

Type float
Read Only No

StagPressure

This property specifies the design point stagnation pressure, P01, at the inlet to the turbine stage. Note that this is defined upstream of the nozzle guide vane ahead of the impeller.

Type Quantity
Read Only No

StagTemp

This property specifies the design point stagnation temperature, T01, at the inlet to the turbine stage. Note that this is defined upstream of the nozzle guide vane ahead of the impeller.

Type Quantity
Read Only No

SurfaceFinish

This property specifies the surface finish of the impeller. The surface roughness has a secondary effect on the calculated efficiency.

Available options:

Machined

Cast

Type RoughnessType
Read Only No

T02

This property reports the total temperature at impeller inlet.

Type Quantity
Read Only Yes

T03

This property reports the total temperature at impeller exit.

Type Quantity
Read Only Yes

T2

This property reports the static temperature at impeller inlet.

Type Quantity
Read Only Yes

T3

This property reports the static temperature at impeller exit.

Type Quantity
Read Only Yes

TipWidth

This property reports the impeller inlet tip width.

Type Quantity
Read Only Yes

TotalLoss

This property reports the sum of the friction, loading, clearance and exit losses. It is equal to one minus the total-to-total stage efficiency. Note this is only available when using the 'Correlation' for the efficiency calculation method, EtaOpt.

Total losses

Type float
Read Only Yes

U2

This property reports the blade speed at the impeller inlet (tip speed)

Type Quantity
Read Only Yes

U3shroud

This property reports the shroud section blade speed (tip speed) at the impeller exit station.

Type Quantity
Read Only Yes

V2

This property reports the absolute velocity at the impeller inlet.

Type Quantity
Read Only Yes

V3rms

This property reports the meanline section absolute velocity at the impeller exit station.

Type Quantity
Read Only Yes

Vax3rms

This property reports the meanline section axial velocity at the impeller exit station.

Type Quantity
Read Only Yes

VelRatio1

This property reports the flow coefficient at impeller exit. This is the ratio of the average axial velocity at the impeller exit (Vax3) to the impeller tip speed (U2).

Type float
Read Only Yes

VelRatio2

This property reports the blade speed ratio, U2/C0, of the impeller, where U2 is the impeller tip speed and C0 is the spouting velocity. In this definition the spouting velocity is calculated from the total-to-static isentropic temperature drop.

Type float
Read Only Yes

Vr2

This property reports the radial velocity at the impeller inlet.

Type Quantity
Read Only Yes

Vw2

This property reports the swirl (tangential) velocity at the impeller inlet

Type Quantity
Read Only Yes

Vw3rms

This property reports the meanline section swirl velocity at the impeller exit station.

Type Quantity
Read Only Yes

W2

This property reports the relative velocity at the impeller inlet.

Type Quantity
Read Only Yes

W3shroud

This property reports the shroud section relative velocity at the impeller exit station.

Type Quantity
Read Only Yes

ZeroBetaInlet

Specifies whether or not the relative flow angle at the impeller inlet is zero. Note that a zero inlet angle is a 'special case' where the exit angles are calculated rather than specified.

Type bool
Read Only No