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Root Cause Investigation of a Non-physical Solution of a Time Domain Harmonic Balance Solver

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The time domain harmonic balance method is an attractive reduced order method of analyzing unsteady flow for turbomachines.However,the method can admit non-physical solutions.Non-physical solutions were encountered from a three-blade-row compressor configuration in a time domain harmonic balance analysis.This paper aims to investigate the root cause of the non-physical solutions.The investigation involves several strategies,which include increasing the number of harmonics,increasing the number of time instants,including scattered modes,including the rotor-rotor interaction,and the use of a new method-the approximate time domain nonlinear harmonic method.Numerical analyses pertinent to each strategy are presented to reveal the root cause of the non-physical solution.It is found that the nonlinear interaction of unsteady flow components with different fundamental frequencies is the cause of the non-physical solution.The non-physical solution can be eliminated by incorporating extra scattered modes or using the approximate time domain nonlinear harmonic method.

The Time Domain Harmonic Balance MethodNon-physical SolutionTurbomachinery Blade Row Interaction

Sen Zhang、Ding-xi Wang

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School of Power and Energy,Northwestern Polytechnical University

Shaanxi Key Laboratory of Internal Aerodynamics in Aero-engines,Northwestern Polytechnical University

National Natural Science Foundation of ChinaNational Science and Technology Major ProjectChina's 111 projectInnovation Foundation for Doctor Dissertation of Northwestern Polytechnical University

519761722017-II-0009-0023B17037CX2023056

2024

10.16492/j.fjjs.2024.02.0007

风机技术
沈阳豉风机研究所（有限公司）

风机技术

影响因子：0.643
ISSN：1006-8155
年,卷(期)：2024.66(2)
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