Session: 35-04 Hot Streaks and Sealing Flows

Paper Number: 83509

83509 - Reconstructing Turbine Non-Uniform Flow Including Hot Streaks Using Spatially Under-Sampled Measurements 

The demand for higher turbine inlet temperature challenges the design of high-pressure turbine (HPT). Although it is well recognized that the HPT inflow is highly unsteady and non-uniform, it is still generally the case that turbines are designed for uniform inlet temperature—often the predicted peak gas temperature due to the vacancy of a reliable methodology for predicting the non-uniform temperature field at HPT inlet. To bridge this gap, this paper establishes a roadmap to predict the turbine inlet temperature non-uniformity using spatially under-sampled temperature measurements at HPT exit through a two-step effort. First, the migration of hot streaks at different levels of circumferential non-uniformity across the two-stage high-pressure turbine from Energy Efficiency Engine (E3) was investigated by solving full-annulus unsteady Reynolds-averaged Navier-Stokes (RANS) equations. Furthermore, the hot streak related signals were resolved based on a few discrete temperature measurements using the multiwavelet approximation method and a projection between HPT exit temperature measurements and the inlet temperature non-uniformity was established. The effectiveness of the method was examined using a RR engine combustor exit temperature profile measured at extreme point in the cycle with promising results obtained. This method offers an appealing approach for real-time monitoring of HPT inlet temperature nonuniformity and further active control of HPT cooling.

Presenting Author: Xu Zhu Tsinghuar University

Presenting Author Biography: ZhuXu is a PhD student at Tsinghua University. His research focuses on turbomachinery aeodynamcis.

Authors:

Xu Zhu Tsinghuar University
Fangyuan Lou Tsinghua University
Kai Zhou Tsinghua University
Xinqian Zheng Tsinghua University