【摘要】 为深化对涡轮进口热斑效应的认识,采用试验和数值方法研究了热斑压力比对涡轮叶栅表面热负荷的影响。试验采用引气管形成热斑,叶片材料为环氧树脂,叶型为C3X。采用数值方法计算了不同热斑压力比(0.980～1.020)和冷气流量比(1%～5%)条件下叶片表面的热负荷。研究表明,计算值与试验值吻合良好。热斑压力比小于1.000时,热斑对叶片表面热负荷无影响;但随着热斑压力比增加,热斑对叶片表面的加热效果越来越明显,尤其是在叶片前缘和吸力面。热斑在涡轮通道中向下游流动时温度不断下降,且热斑压力比越小,热斑温度下降越快,方向偏转也越明显。随着冷气流量比增加,叶片表面温度显著下降。更多还原

【Abstract】 To deepen the understanding of heat streak effect on the turbine vane, experimental and numerical researches were conducted to examine the heat streak pressure ratio on the wall temperature of the turbine cascade. In the test, a delivery pipe was used to form the heat streak and the material of the C3 X vane was epoxy resin. And in the numerical researches, thermal performances of the vane were computed at different heat steak pressure ratio(0.980～1.020), and different cooling air ratio(1%～5%). Overall, good agreement between experimental results and CFD predictions was obtained for experimental conditions considered. Furthermore, when the pressure ratio is below 1.000, the heat streak have no significant impact on the vane; but when the pressure ratio is beyond 1.000, the heat load enhancement of the vane is notable, especially of the leading edge and suction surface. Moreover, the temperature of heat streak reduced along the flow direction, and the deflection effect of the heat streak flow is obvious at small pressure ratio. Finally, the temperature of the vane reduced with the increase of cooling air ratio.更多还原