Flamelet/Progress Variable Formulation With Pressure Variations for Modeling Rocket Combustion Dynamics Will Be Presented at AIAA SciTech 2024

Conference: AIAA SciTech 2024
Title: Flamelet/Progress Variable Formulation With Pressure Variations for Modeling Rocket Combustion Dynamics
Presenter: Ashvin Hosangadi
Date: Monday, January 8
Session: LP01
Time: 10:50 AM

Abstract: A zonal, multi-physics modeling framework for dynamic combustion processes, that can capture relevant local physics and simulate system behavior while significantly reducing computational cost has been developed. The framework is based on a flamelet/progress variable (FPV) formulation with upgrades to account for dynamic pressure conditions in the combustion chamber. The computational efficiency results from a combination of much smaller number of convective scalar equations and enhanced numerical stability that permits larger time steps than finite-rate kinetics formulation. The FPV framework has been demonstrated on a 3-D configuration featuring a linear array of nine gas-gas, shear coaxial injectors [3][9]. A rigorous evaluation of the ability of the FPV formulation to accurately predict self-excited tangential instabilities has been conducted by comparing both with earlier finite-rate simulations as well as test data [3]. The side wall fluctuations exhibit a 1-T mode, and we obtained a close match for the frequency values as well as the relative amplitudes between the FPV and finite rate formulation (1.3% difference) as well as with the test data (3.7% error). The close match in the frequency and amplitude of the instability predicted by the FPV solution confirms that the FPV formulation provides sufficient accuracy at reduced computational cost.

Presentation Number: AIAA-2024-0152

Authors: Ashvin Hosangadi¹, Andrea C Zambon¹, Balaji Muralidharan¹, Timothy Weathers¹, Cheng Huang², Charles Merkle³

¹Combustion Research and Flow Technology Inc, Pipersville, Pennsylvania, United States; ²University of Kansas School of Engineering, Lawrence, Kansas, United States; ³Purdue University System, West Lafayette, Indiana, United States