發(fā)布時(shí)間：2018-08-17 10:19

【摘要】：為研究水泵水輪機(jī)在水輪機(jī)制動(dòng)工況運(yùn)行時(shí)導(dǎo)葉區(qū)域產(chǎn)生異常紊動(dòng)的內(nèi)流機(jī)理,在完成S區(qū)特性試驗(yàn)的基礎(chǔ)上,基于SST k-ω湍流模型及SIMPLEC算法,對活動(dòng)導(dǎo)葉小開度制動(dòng)工況進(jìn)行非定常數(shù)值計(jì)算,并與試驗(yàn)數(shù)據(jù)進(jìn)行對比驗(yàn)證,對此工況下水泵水輪機(jī)導(dǎo)葉區(qū)域流場結(jié)構(gòu)和壓力脈動(dòng)規(guī)律進(jìn)行了全面分析.研究結(jié)果表明:固定導(dǎo)葉與活動(dòng)導(dǎo)葉后均存在不同程度的尾跡結(jié)構(gòu),活動(dòng)導(dǎo)葉后渦系結(jié)構(gòu)的演變和能量轉(zhuǎn)化是誘發(fā)導(dǎo)葉區(qū)流動(dòng)不穩(wěn)定的主要原因之一;活動(dòng)導(dǎo)葉進(jìn)口的復(fù)雜流動(dòng)也增加了沖擊損失,對導(dǎo)葉振動(dòng)造成一定影響;對活動(dòng)導(dǎo)葉區(qū)的壓力脈動(dòng)監(jiān)測進(jìn)一步佐證了導(dǎo)葉區(qū)流動(dòng)的不穩(wěn)定性;通過對時(shí)域特性和頻域特性的分析發(fā)現(xiàn)其相對幅值達(dá)到了水輪機(jī)及水泵正常運(yùn)行工況的3倍以上,其主頻為葉頻,幅值較大且屬中頻成分,可能引發(fā)共振效應(yīng).研究結(jié)果可為水泵水輪機(jī)設(shè)計(jì)優(yōu)化提供指導(dǎo)意義.
[Abstract]:In order to study the internal flow mechanism of abnormal turbulence in the guide vane region of a pump turbine under braking condition, the unsteady value of the small opening braking condition of the guide vane was calculated based on the S ST k-_turbulence model and SIMPLEC algorithm on the basis of the S zone characteristic test, and the results were compared with the experimental data. The flow field structure and pressure fluctuation in the guide vane region of a pump turbine are analyzed comprehensively. The results show that the wake structure exists in different degrees after the fixed guide vane and the movable guide vane. The complex flow also increases the impact loss, which has a certain impact on the guide vane vibration; the pressure fluctuation monitoring in the guide vane region further confirms the instability of the flow in the guide vane region; through the analysis of the time-domain and frequency-domain characteristics, it is found that the relative amplitude is more than three times of the normal operating conditions of the turbine and pump, and the main frequency is the blade. Frequency, amplitude and medium frequency components may cause resonance effect. The results can provide guidance for design optimization of pump turbine.
【作者單位】： 蘭州理工大學(xué)能源與動(dòng)力工程學(xué)院;甘肅省流體機(jī)械及系統(tǒng)重點(diǎn)實(shí)驗(yàn)室;
【基金】：國家自然科學(xué)基金資助項(xiàng)目(51566009)
【分類號(hào)】：TK730.1

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