液力缓速器全充液工况下本征正交基对流场重构精度的影响规律

doi:10.13229/j.cnki.jdxbgxb20180583

摘要/Abstract

摘要：

为揭示本征正交基对流场重构精度的影响规律，以全充液状态下液力缓速器定轮交互面上的流场为研究对象，分别获取速度和压力本征正交基。研究了影响本征正交基的瞬像和转速，并利用本征正交基和代理模型技术对流场进行预测。结果表明：瞬像集合的选择和采样频率对本征正交基的精确性影响较大，而液力缓速器动轮转速对速度场和压力场的本征正交基影响较小;基于本征正交基的流场预测具有一定精度。

关键词: 流体传动与控制, 液力缓速器, 本征正交基, 瞬像, 采样频率, 流场重构

Abstract:

In order to study the influence of Proper Orthogonal Decomposition (POD) basis functions on the accuracy of flow field reconstruction, the velocity and pressure proper orthogonal bases were obtained respectively for the flow field on the stator interaction surface of hydraulic retarder under full-filled condition. The influences of the instantaneous image factors and rotational speed factors on the proper orthogonal basis were studied, and the flow field is predicted by means of proper orthogonal basis and surrogate model technology. Results show that both the spiting of snapshots database and the frequency of sampling snapshots have significant effects on flow field reconstruction accuracy by POD basis functions while the features of POD basis functions are immune to the speed of the rotor, and the flow field reconstruction based on POD basis is of certain accuracy.

Key words: fluid transmission and control, hydrodynamic retarder, proper orthogonal decomposition basis function, snapshot, sampling frequency, flow field reconstruction

中图分类号:

TH137

魏巍,刘旭,韩雪永,闫清东. 液力缓速器全充液工况下本征正交基对流场重构精度的影响规律[J]. 吉林大学学报(工学版), 2019, 49(6): 1959-1968.

Wei WEI,Xu LIU,Xue-yong HAN,Qing-dong YAN. Flow field reconstruction accuracy influence of proper orthogonal decomposition basis functions in hydrodynamic retarderunder full⁃filled operating condition[J]. Journal of Jilin University(Engineering and Technology Edition), 2019, 49(6): 1959-1968.

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参考文献

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转速/(r·min^-1)	周期/s	总时间步数	时间步长/(10^-4 s)
500	0.12	800	2.4
1 000	0.24	800	1.2

瞬像数目	50	100	125	250	500
时间间隔/ms	1.2	0.6	0.48	0.24	0.12
采样频率/Hz	83.3	1 666.66	2 083.3	4 166.6	8 333.3