Determination of Shock Induced loads on Waste Gate Valves for Heavy Duty applications
2022-01-0714
03/29/2022
- Content
- The turbocharger used with an engine is conventionally equipped with a Waste Gate (WG) valve to control the mass flux of air supplied to the intake system. A WG valve is actuated according to a defined and constant maximum boost pressure downstream of the compressor in the whole engine operating range and directly controls the maximum power the engine can supply. In heavy industrial applications, the WG valve is often subjected to failure because of several reasons. In the present study, the formation of shocks in the region near the valve has been explored as a probable cause for the failure. Furthermore, flow-induced transience near the WG leads to valve flutter which may resonate with the natural frequency of the control mechanism resulting in an abject breakdown. The commercial code of Fluent® has been optimized to predict the intensity of shocks formed near the WG. Both RANS and LES based solver algorithms have been explored to model the valve flutter in terms of the moment (torque) about the control axis. The effect of valve opening, boundary conditions, and plumbing near the WG on the valve flutter has been accounted. Crank resolved boundary conditions in terms of total pressure have been imposed to get results close to experimental (test) data. A fast Fourier transform (FFT) has been used to compare valve flutter frequencies from FEA, CFD and test data. This study will help determine flow induced failures in WG valves and will form a basis for further fatigue calculations.
- Citation
- Varshney, A., and Bourothu, P., "Determination of Shock Induced loads on Waste Gate Valves for Heavy Duty applications," SAE Technical Paper 2022-01-0714, 2022, .