Analysis of Shroud and Disk Heat Transfer in Aero-Engine Compressor Rotors
Analysis of Shroud and Disk Heat Transfer in Aero-Engine Compressor Rotors
复制标题
航空发动机压气机转子护罩和盘的传热分析
DOI：
10.1115/1.4050631
复制
发表时间：
2021
期刊：
影响因子：
--
通讯作者：
Jackson R
中科院分区：
文献类型：
--
作者：
Jackson R
航空发动机旋转压气机腔内的换热主要由浮力决定，浮力可以用Grashof数来表征。非定常和不稳定的浮力诱导流动结构会影响压气机转子内的温度和应力，从而影响圆盘的径向生长。此外，来自圆盘和护罩的热传递增加了冷却空气流通的温度。本文包括两个相互联系的部分。首先，通过在发动机模拟条件下在浴缸压缩机-腔体试验台上收集的稳态热流密度测量，确定了旋转腔体护罩的换热关联式。Nusselt数是根据护罩附近的空腔空气温度计算的，这是用欧文-唐浮力模型预测的。围护结构的换热与引力场中水平平板的自由对流是一致的。使用最大似然估计和Rayleigh-Bénard方程将裹尸布Nusselt数与局部Grashof数进行关联。其次，利用能量平衡从测量的圆盘和护罩热流计算轴向通流的焓升。利用贝叶斯模型和圆形翅片的方程，从实测的稳态圆盘温度的径向分布推导出圆盘流量。计算的通流温升与直接热电偶测量结果一致。空腔入口处附近的复杂三维流动可以在贯通流中产生上游的焓交换，而旋转诱导流可以在环空外部产生上游轴向流动。
Heat transfer within the rotating compressor cavity of an aero-engine is predominantly governed by buoyancy, which can be characterized by the Grashof number. Unsteady and unstable buoyancy-induced flow structures influence the temperatures and stresses in the compressor rotors, and these affect the radial growth of the disks. In addition, the heat transfer from the disks and shroud increases the temperature of the throughflow of cooling air. This paper contains two connected parts. First, a heat transfer correlation for the shroud of a rotating cavity was determined from steady-state heat flux measurements collected in the bath compressor-cavity rig at engine-simulated conditions. The Nusselt numbers were based on the cavity air temperature adjacent to the shroud, which was predicted using the Owen–Tang buoyancy model. Heat transfer from the shroud was consistent with free convection from a horizontal plate in a gravitational field. Maximum likelihood estimation was used with a Rayleigh–Bénard equation to correlate the shroud Nusselt number with the local Grashof number. Second, an energy balance was used to calculate the enthalpy rise of the axial throughflow from the measured disk and shroud heat fluxes. Disk fluxes were derived from radial distributions of measured steady-state disk temperatures using a Bayesian model and the equations for a circular fin. The calculated throughflow temperature rise was consistent with direct thermocouple measurements. The complex, three-dimensional flow near the cavity entrance can result in enthalpy exchange penetrating upstream in the throughflow, and rotationally induced flow can create upstream axial flow in the outer part of the annulus.
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影响因子：
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