VMFRT006

VMFRT006
Adiabatic Compression of Air in Cylinder by a Reciprocating Piston

Overview

Reference	Russell, L.D., Adebiyi, G.A. Classical Thermodynamics, Saunders College Publishing, Philadelphia, PA, 1993.
Solver	Ansys Forte
Physics/Models	Dynamic Mesh, Transient flow with ideal gas effects
Input Files	`VMFRT006.ftsim`
Project Files	Link to Project Files Download Page

Test Case

This test simulates air undergoing an adiabatic compression due to the upward movement of a piston inside a cylinder. Initially the air inside the cylinder is at atmospheric conditions and the piston is located at the Bottom Dead Center (BDC). The piston reaches the Top Dead Center (TDC) when at the 360° crank angle. The compression is assumed to be adiabatic. Results in Figure 207: Pressure and Figure 208: Temperature are compared against the 2-D analytical solution mentioned in the Reference.

Test case properties
RPM	Stroke	Bore_diameter	Composition_amb	P_initial	T_initial
10	8 m	8 m	O2=21% N2=79%	1 atm	300 K
Simulation Settings
Initial CA	Final CA	Cycle type	Wall refinements	Mesh size_max	dt_MAX
180 deg	540 deg	4-stroke	Head=0.5 m Liner=0.5 m Piston=0.25 m	1 m	5 ms

Results Comparison for Ansys Forte

Figure 207: Pressure

Figure 208: Temperature