Performance Prediction Method of Compressor under All Operating Conditions

Abstract

The invention discloses a full-working condition performance prediction method for a compressor, and aims at providing a rapid and accurate full-working condition aerodynamic performance prediction method so as to increase the design and optimization efficiency of the compressor. In the method, a formula is established by taking parameters of a design point as the reference to predict the flow, the efficiency and the overall pressure ratio of an off-design working condition; in a flow prediction method, firstly, the flow of the design point is converted according to an empirical formula to flow corresponding to a peak efficiency point at different rotating speeds, and then, blocking flow and surging flow at respective rotating speeds are calculated; in an efficiency prediction method, firstly, the efficiency of the design point is converted according to the empirical formula to peak efficiency at different rotating speeds, and then, the efficiency at different rotating speeds is calculated according to an elliptic piecewise approximation method; and in a prediction method for the overall pressure ratio, work factors at different rotating speeds and different flow are calculated according to the thought of the equivalent width of an impeller exit, and the work factors are combined with current efficiency to obtain the overall pressure ratio. By applying the full-working condition performance prediction method to design and optimization of the compressor, the design cycle can be remarkably shortened, and the design cost is reduced.

Description

technical field [0001] The invention relates to the field of mechanical technology, and more specifically, relates to a method for predicting the aerodynamic performance of a centrifugal compressor under all working conditions. Background technique [0002] Centrifugal compressors are widely used in aero-engines, ground gas turbines, automobile and ship turbochargers, petrochemical compressors, and play an irreplaceable role in the fields of national defense and civil industry. In the process of aerodynamic design and optimization of a centrifugal compressor, it is usually necessary to repeatedly modify the geometric model and evaluate its aerodynamic performance under all operating conditions. Quickly and accurately predicting the aerodynamic performance of the compressor under all working conditions is a key technology in the optimization design. The traditional method generally adopts numerical simulation method to calculate the aerodynamic performance of all working con...

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Problems solved by technology

[0003] The traditional flow prediction method uses the blocking theoretical model and the stall theoretical model to predict the blocking flow and surge flow respectively. The theoretical model has been greatly simplified in the derivation process, and it is essentially a one-dimensional prediction model, so the prediction accuracy is poor.

Especially for compact high-speed turbocharger compressors, the prediction results are not robust

[0004] The traditional efficiency prediction method and the total pressure ratio prediction method establish a semi-empirical loss model through theoretical analysis, and the reliability depends on the specific compressor used to establish the loss model. Therefore, there are many loss models, and the coefficient calibration workload is huge, and the versatility is relatively low. Difference

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