涡轴发动机燃烧室头部流场试验研究

An Experimental Investigation on the Head of Annular Combustor for the Turbo Shaft Engine

对涡轴发动机短环直流燃烧室进行了突扩区和火焰筒头部间流场试验研究。采用ＬＤＶ多谱勒激光测速仪测量了燃烧室头部的时均速度场和各测量点的紊流强度，并绘制了流谱。通过对七种不同结构方案扩压器进行试验，研究了几何参数和前置扩压器出口气动参数变化对突扩区和火焰筒头部间速度场以及各点紊流强度、旋涡位置与大小的影响。通过流场分析找出各参数对燃烧室性能影响的规律。本试验结果可为涡轴燃烧室的优化设计提供可靠的有应用价值的试验依据。

An experimental investigation has been carried out to study the aerodynamic characteristics of two types of annular combustor sector for the turbo shaft engine. Mean velocity profiles and turbulent intensity inside the asymmetric sudden expansion regions between the pre diffuser exit and the head of the flame tube are measured, by laser Doppler anemometry. Airflow patterns for seven different configuration sectors are experimentally mapped. The anemometry results reveal that two eddies occur in the sudden expansion regions and the flow patterns change with geometric parameters and inlet velocities. Measurements may be applied to develop and improve combustor design.