發(fā)布時(shí)間：2018-06-08 21:31

  本文選題：含氣率 + 液力透平��； 參考：《航空動(dòng)力學(xué)報(bào)》2017年09期

【摘要】：為了研究含氣率對液力透平內(nèi)部壓力的影響,以比轉(zhuǎn)速為84.5的單級單吸離心泵反轉(zhuǎn)作液力透平并對其內(nèi)部流場進(jìn)行CFD瞬態(tài)數(shù)值模擬,獲得了氣體在液力透平內(nèi)的分布規(guī)律以及氣液兩相介質(zhì)下透平內(nèi)部流場的壓力脈動(dòng)變化規(guī)律。結(jié)果表明:從蝸殼進(jìn)口到葉輪出口,含氣率逐漸增加,含氣率等于0.2時(shí)蝸殼出口、葉輪進(jìn)口氣體的尾跡效應(yīng)明顯,分布不夠均勻。葉輪出口有氣體聚集現(xiàn)象,氣體體積分?jǐn)?shù)越高,聚集現(xiàn)象越明顯。進(jìn)口含氣率對透平蝸殼、葉輪內(nèi)各點(diǎn)的相對壓力分布影響明顯,各點(diǎn)的相對壓力隨著透平進(jìn)口含氣率增加而降低。含氣率小于0.05時(shí)其對透平內(nèi)各監(jiān)測點(diǎn)的壓力脈動(dòng)主頻幅值影響不大,含氣率大于0.05后其對液力透平內(nèi)各監(jiān)測點(diǎn)的壓力脈動(dòng)主頻幅值有影響,含氣率越高,壓力脈動(dòng)主頻幅值越小。不同含氣率下液力透平蝸殼周向、徑向以及葉輪內(nèi)的壓力脈動(dòng)主頻均等于葉輪葉片的轉(zhuǎn)動(dòng)頻率。
[Abstract]:In order to study the effect of gas content on the internal pressure of hydraulic turbine, a single stage suction centrifugal pump with a specific speed of 84.5 was used to reverse the hydraulic turbine and the CFD transient numerical simulation of its internal flow field was carried out. The distribution of gas in hydraulic turbine and the variation of pressure fluctuation in turbine flow field in gas-liquid two-phase medium are obtained. The results show that from the inlet of the volute to the outlet of the impeller, the gas content increases gradually, and the gas content is equal to 0.2 at the outlet of the volute. The wake effect of the inlet gas of the impeller is obvious and the distribution is not uniform. The higher the volume fraction of gas, the more obvious the phenomenon of gas accumulation at the outlet of impeller. The relative pressure distribution of each point in the turbine volute and impeller is obviously affected by the inlet gas content, and the relative pressure at each point decreases with the increase of the inlet gas content of the turbine. When the gas content is less than 0.05, it has little effect on the main frequency amplitude of pressure pulsation in each monitoring point in turbine. When the gas content is greater than 0.05, it has an effect on the main frequency amplitude of pressure pulsation in each monitoring point of hydraulic turbine. The higher the gas content is, the higher the gas content is. The smaller the main frequency amplitude of pressure pulsation is. The main frequency of pressure pulsation is equal to the rotating frequency of the impeller blade in the circumferential direction, radial direction and impeller pressure pulsation frequency of the volute with different gas content.
【作者單位】： 蘭州理工大學(xué)能源與動(dòng)力工程學(xué)院;
【基金】：國家自然科學(xué)基金(51569013,51269011) 甘肅省青年科技基金計(jì)劃(145RJYA312)
【分類號(hào)】：TH311

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