非定常分离控制中的相位采样

PHASE SAMPLING IN THE UNSTEADY SEPARATED FLOW FIELD

本文介绍了非定常分离控制中的相位采样方法,该方法同样适用于任何受到周期性外加干扰作用的流场测量。所谓相位采样就是要使所采集的流体参数样本与干扰信号中的周期相位一一对应,这只能由计算机来实现。文中所提出的具体采样方案适用于目前国内广为使用的十六位微处理机(如 IBM-PC 及其兼容机、INTEL/86/330机等)。

This paper introduces the phase sampling method employedin the study of the unsteady control of the separation.This methodis also applicable to any of the flow field which subjected to the forcedexcitation.The main purpose of the phase sampling is to synchronizethe flow data sampled with the phase signal of the forced excitation,sothat with the help of the computer the phase related sample can be ac-quired and processed for expedient analysis of the unsteady character-istics of the flow field.Unsteadiness are introduced by loud-speakerand flap excitation which represent both the continual and pulsed sig-nals.The particular phase sampling method proposed in this paper issuitable to the 16 bit micro-computer,such as IBM-PC or INTER86/330series,which have been widely used throughout the country.