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作者通过对涡轮特性曲线的物理意义和几何特征的分析,提出了适用于喷嘴安装角可调的涡轮流量特性和效率特性的拟合模型,并提出了一种新的计算方法来确定拟合数学模型中的待定参数。用该模型拟合了某发动机变几何动力涡轮的特性。与原节点数据相比,流量和效率特性拟合回代值的平均相对误差分别为0.6％和0.5％。另外又拟合了某定几何高压涡轮的流量特性,平均相对误差值为0.6％,其结果令人满意。
Based on the analysis of the physical meaning and the geometric characteristics of the turbine characteristic curve, the author presents a fitting model for the flow characteristics and efficiency characteristics of a turbine with adjustable nozzle mounting angle and proposes a new calculation method to determine the fitting mathematical Pending parameters in the model. The model was used to fit the characteristics of an engine with variable geometry power turbine. Compared with the original node data, the average relative errors of the fitted values of flow and efficiency are 0.6% and 0.5%, respectively. In addition, the flow characteristics of a certain geometry high-pressure turbine are also fitted. The average relative error is 0.6%, and the result is satisfactory.