涡喷发动机涡轮密封舱小气路流场数值计算

Numerical simulation on viscous flow in the secondary flow path of a turbine sealed cabin

关键词:  涡轮喷气发动机  粘性流  湍流  流动分布  数值计算  故障分析

Key words:  Turbojet engine  Viscous flow  Turbulent flow  Flow distribution  Numerical simulation  Fault diagnosis

摘要:

运用 NUMECA的三维粘性流动数值计算软件 FINE/ TURBO对涡喷发动机涡轮密封舱小气路中的复杂流场进行研究 ,计算中采用 Jameson的中心差分格式结合 Baldwin- Lomax湍流模型求解雷诺平均 N- S方程 ,得到了三维复杂流场中气体参数分布的详细结构和规律 ,具有较高的精度 ,为小气路中的故障的诊断提供数值依据

Abstract:

A 3 D viscous flow program FINE/TURBO was used to solve the complex flow field of the secondary flow path in the turbine sealed cabin of a gas engine. The central difference scheme of Jameson and algebraic turbulence model of Baldwin Lomax were used. Detailed flow structures and parameters were showed. Seven different structure schemes were used in the calculation and the simulation results were compared each other. The results show that the dimension of the sealed ring gap is the critical parameter to the flow rate distribution. The solutions can provide substantial numerical data for the failure diagnosis in the secondary flow path of gas turbine engine.