本文關(guān)鍵詞： 渦輪制動器 流動結(jié)構(gòu) 瞬態(tài)過程 空化 力矩　出處：《工程熱物理學(xué)報》2017年10期 　論文類型：期刊論文

【摘要】：為描述液力渦輪制動器內(nèi)的流動特征及流動對制動器力矩性能的影響,采用計算流體動力學(xué)方法對制動器內(nèi)的流動結(jié)構(gòu)及空化現(xiàn)象進(jìn)行了研究,獲得了渦輪制動器瞬態(tài)啟動和停止過程中轉(zhuǎn)輪及擋板附近的流動參數(shù)分布,捕捉了制動器封閉腔體內(nèi)的空化區(qū)位置和形態(tài),求解了擋板上受到的流體載荷。結(jié)果表明,制動器腔體內(nèi)存在著大尺度流動結(jié)構(gòu),其隨著擋板與轉(zhuǎn)輪之間的軸向距離增加而沿軸向發(fā)展;空化區(qū)出現(xiàn)在轉(zhuǎn)輪葉片背面及根部附近,空化相體積份額隨轉(zhuǎn)輪轉(zhuǎn)速增加而增大,但未對制動器的力矩系數(shù)造成明顯影響;作用在擋板上的軸向流體作用力的合力方向始終指向轉(zhuǎn)輪側(cè),該力的大小隨轉(zhuǎn)輪轉(zhuǎn)速和葉輪與擋板間距增加而增加。
[Abstract]:In order to describe the flow characteristics in the hydraulic turbine brake and the effect of the flow on the torque performance of the brake, the flow structure and cavitation in the brake are studied by using computational fluid dynamics (CFD) method. The distribution of the flow parameters near the runner and the baffle during the transient start-up and stop of the turbine brake is obtained. The position and shape of the cavitation zone in the closed chamber of the brake are captured, and the fluid load on the baffle is solved. The results show that, There is a large scale flow structure in the brake cavity, which develops along the axial direction with the increase of the axial distance between the baffle and the runner, and the cavitation area appears near the back and the root of the runner blade, and the volume share of the cavitation phase increases with the increase of the rotating speed of the runner. However, the torque coefficient of the brake is not significantly affected, and the resultant direction of the axial fluid force acting on the baffle always points to the runner side, and the force increases with the increase of the speed of the runner and the distance between the impeller and the baffle.
【作者單位】： 江蘇大學(xué)能源與動力工程學(xué)院;
【基金】：國家自然科學(xué)基金項目資助(No.51676087) 江蘇省六大人才高峰項目資助(No.2015-ZBZZ-018)
【分類號】：O35;TH13

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