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| 1 | 混流式核主泵内流动结构与压力脉动特性关联分析显示文摘核主泵内的流动不稳定将会引起严重振动,不利于其安全稳定运行。因此本文基于大涡模拟(LES)数值计算方法对几个典型工况下核主泵内部非稳态流动结构及其压力脉动特性进行全面阐述与关联性分析。研究表明,随着流量的增加,动静干涉作用在导叶出口处逐渐增加;偏工况条件下,导叶出口处压力脉动频谱低频段中均出现复杂激励频率,尤其是靠近出液管附近的导叶出口处。核主泵在偏大流量工况下运行时壳体右侧内部非稳态流动结构相较于壳体左侧更加复杂;在偏小流量工况下运行时壳体底部压力脉动更加剧烈。本文进一步详细描述了核主泵球形壳体内强涡量区的流动结构及其成因,并且发现测点处的压力频谱与涡量频谱有相同的主要激励频率,因此证明核主泵内非定常旋涡流动结构是激励压力脉动的主因之一。 | 倪丹 杨敏官 高波 李忠 李玉婷 陆胜 | 2017 | 工程热物理学报2017，38，8： | 7 |
| 2 | 射流式离心泵内场流体动力噪声特性分析显示文摘对JET750G1型射流式离心泵内场噪声进行数值计算及试验,分析该泵过流部件诱发的流动噪声和流激噪声特性。采用大涡模拟法进行不同工况的非定常数值计算,输出各过流部件表面的压力脉动作为偶极子声源。运用声学有限元方法预测流动噪声;运用声学有限元耦合结构有限元方法预测流激噪声。搭建射流式离心泵内场噪声测试系统,用水听器对泵出口的流体动力噪声进行测试,获得噪声的时域和频域信息。分析结果表明:噪声在轴频和叶频处计算和试验测试误差在4%以内;叶轮和导叶的动静干涉以及流体和结构的共振均是诱发射流式离心泵内场噪声的重要因素,过流部件自身的结构特性对内场噪声有一定影响;流动噪声整体大于流激噪声,表明内场噪声主要由流体的压力脉动特性决定;叶轮旋转偶极子声源诱发的内场噪声在轴频(47.5 Hz)处达到180 d B左右,在射流式离心泵的内场噪声中起主导作用。研究结果为射流式离心泵的低噪设计提供了参考。 | 郭荣 李仁年 张人会 宋启策 | 2018 | 农业机械学报2018，49，4： | 5 |
| 3 | Effects of Variable Jet Nozzle Angles on Cross-Flow Suppression and Heat Transfer Enhancement of Swirl Chamber显示文摘This paper investigated the effects of variable jetting nozzle angles on the cross-flow suppression and heat transfer enhancement of swirl cooling in gas turbine leading edge. The swirl chamber with vertical jet nozzles was set as the baseline, and its flow fields and heat transfer characteristics were analyzed by 3D steady state Reynolds-averaged numerical methods to reveal the mechanism of cross-flow weakening the downstream jets and heat transfer. On this basis, the flow structure on different cross sections and heat transfer characteristics of swirl chamber with variable jetting nozzle angels were compared with the baseline swirl chamber. The results indicated that for the baseline swirl chamber the circumferential velocity gradually decreased and the axial velocity gradually increased, and the cross-flow gradually formed. The cross-flow deflected the downstream jets and drawn them to the center of the chamber, thus weakening the heat transfer. For swirl chamber with variable jetting nozzle angles, the air axial velocity is axial upstream, opposite to the mainstream, so that the impact effects of cross-flow on the jets were reduced, and the heat transfer was enhanced. Furthermore, with the increase of axial velocity along the swirl chamber, the jetting nozzle angle also gradually increased, as well as the effect of cross-flow suppression, which formed a relative balance. For all swirl chambers with variable jet nozzle angles, the thermal performance factors were all larger than 1, which indicated the heat transfer was enhanced with less friction increment. | XIAO Kun HE Juan FENG Zhenping | 2022 | Journal of Thermal Science2022，31，1： | 1 |
| 4 | 不同条件对煤在梯度燃烧炉内流场的影响研究显示文摘文章研究了在冷态条件下不同结构参数和操作条件对煤在梯度燃烧炉内流场的影响,如不同风口角度,不同风量等的影响。试验用PIV激光仪对直径300mm的梯度燃烧炉内煤粉颗粒的速度分布进行了研究,结果表明在风口角度为16°,一次风口风量0.3667 m3/min和二次风口风量1.4667 m3/min时,煤粉在炉内停留时间最长,燃烧时间充分,梯度燃烧炉工作效率最高,大量实验数据为下一步热态试验进一步优化梯度燃烧炉结构和操作参数提供基础。 | 刘浩 张玲玲 苍大强 郭俊祥 | 2018 | 冶金能源2018，37，2： | 0 |
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