An Approximate Time Domain Nonlinear Harmonic Method for Analyzing Unsteady Flows With Multiple Fundamental ModesSource: Journal of Turbomachinery:;2022:;volume( 144 ):;issue: 012::page 121002Author:Wang, Dingxi;Zhang, Sen
DOI: 10.1115/1.4055266Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: In this article, a new hybrid time and frequency domain method called the approximate time domain nonlinear harmonic method is proposed for a robust and efficient analysis of turbomachinery unsteady flow with more than one fundamental mode. The proposed method combines the features of the nonlinear harmonic method and the time domain harmonic balance method. Unsteady flow components are grouped according to their fundamental frequencies and inter blade phase angles, and separate unsteady flow governing equations are constructed for each mode group. These mode groups are connected using the least squares method based Fourier transform. The proposed method is expected to be exact for a linear problem but approximate for a nonlinear problem. Three sets of analyses with increasing levels of difficulties are presented to demonstrate the validity and effectiveness of the proposed method by comparing it with the time domain harmonic balance method based on the almost periodic Fourier transform.
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contributor author | Wang, Dingxi;Zhang, Sen | |
date accessioned | 2022-12-27T23:21:23Z | |
date available | 2022-12-27T23:21:23Z | |
date copyright | 9/15/2022 12:00:00 AM | |
date issued | 2022 | |
identifier issn | 0889-504X | |
identifier other | turbo_144_12_121002.pdf | |
identifier uri | http://yetl.yabesh.ir/yetl1/handle/yetl/4288452 | |
description abstract | In this article, a new hybrid time and frequency domain method called the approximate time domain nonlinear harmonic method is proposed for a robust and efficient analysis of turbomachinery unsteady flow with more than one fundamental mode. The proposed method combines the features of the nonlinear harmonic method and the time domain harmonic balance method. Unsteady flow components are grouped according to their fundamental frequencies and inter blade phase angles, and separate unsteady flow governing equations are constructed for each mode group. These mode groups are connected using the least squares method based Fourier transform. The proposed method is expected to be exact for a linear problem but approximate for a nonlinear problem. Three sets of analyses with increasing levels of difficulties are presented to demonstrate the validity and effectiveness of the proposed method by comparing it with the time domain harmonic balance method based on the almost periodic Fourier transform. | |
publisher | The American Society of Mechanical Engineers (ASME) | |
title | An Approximate Time Domain Nonlinear Harmonic Method for Analyzing Unsteady Flows With Multiple Fundamental Modes | |
type | Journal Paper | |
journal volume | 144 | |
journal issue | 12 | |
journal title | Journal of Turbomachinery | |
identifier doi | 10.1115/1.4055266 | |
journal fristpage | 121002 | |
journal lastpage | 121002_12 | |
page | 12 | |
tree | Journal of Turbomachinery:;2022:;volume( 144 ):;issue: 012 | |
contenttype | Fulltext |