本文選題：噴射泵 + 數(shù)值計算�。� 參考：《大連理工大學(xué)》2011年碩士論文

【摘要】：噴射泵是一種用來傳遞能量、質(zhì)量的流體機械設(shè)備。在噴射泵中兩股不同壓力的流體相互混合,發(fā)生能量交換后形成一種居中壓力的混合流體。噴射泵提高引射流體的壓力而不直接消耗機械能,并且由于它自身具有的獨特優(yōu)點如工作可靠、沒有轉(zhuǎn)動部件、安裝維護方便等受到人們的青睞而被廣泛的應(yīng)用到了工程實際的各個領(lǐng)域中。 本文通過商用軟件FLUENT對噴射泵的內(nèi)部流場進行分析,并在此基礎(chǔ)上分析了噴射泵結(jié)構(gòu)參數(shù)和工作參數(shù)及其變化對噴射泵性能的影響。應(yīng)用噴射泵的引射增壓功能,設(shè)計了輸送高溫飽和水的離心式水泵的防汽蝕裝置,同時對防汽蝕裝置的工作性能進行了深入的研究。本文的主要工作如下： 1.根據(jù)能量守恒原理和動量守恒原理推導(dǎo)出噴射泵的性能曲線及最佳截面比的公式,為防汽蝕裝置中噴射泵的設(shè)計計算和性能分析奠定基礎(chǔ)。 2.針對噴射泵進行物理和幾何建模,應(yīng)用商用軟件FLUENT分析噴射泵內(nèi)部流動壓力和速度的變化。并且分析了喉管入口收縮角對噴射泵性能的影響,經(jīng)過計算本文發(fā)現(xiàn)喉部入口收縮角在20°至45°之間白選取對噴射泵的效率影響不大,并且發(fā)現(xiàn)喉部入口收縮角較小時噴射泵更容易發(fā)生汽蝕。 3.在噴射泵數(shù)值計算的基礎(chǔ)上分析截面比為6-11的噴射泵的工作壓力、引射壓力、出口混合壓力對其性能的影響以及當(dāng)噴射泵總揚程不變時吸上高度和排出壓力與流量比之間的關(guān)系。 4.在噴射泵內(nèi)部流場、性能分析的基礎(chǔ)上,建立基于噴射泵的防汽蝕裝置性能計算模型。并對防汽蝕裝置的變工況運行規(guī)律進行研究。
[Abstract]:Jet pump is a kind of fluid mechanical equipment used to transfer energy and mass. In the jet pump, two fluids with different pressures are mixed with each other, and after energy exchange, a mixed fluid with intermediate pressure is formed. The jet pump increases the pressure of the jet fluid without directly consuming mechanical energy, and because of its unique advantages such as reliability of operation, no rotating parts, The convenience of installation and maintenance has been widely used in various fields of engineering. In this paper, the internal flow field of the jet pump is analyzed by commercial software FLUENT, and on this basis, the influence of the structural and working parameters of the jet pump and its variation on the performance of the jet pump is analyzed. The cavitation protection device of centrifugal pump conveying high temperature saturated water is designed by using ejection and supercharging function of jet pump. At the same time, the working performance of anti-cavitation device is deeply studied. The main work of this paper is as follows: 1. According to the principle of energy conservation and momentum conservation, the formula of the performance curve and the optimum cross section ratio of the jet pump is derived, which lays a foundation for the design calculation and performance analysis of the jet pump in the cavitation protection device. 2. Based on the physical and geometric modeling of the jet pump, the variation of flow pressure and velocity in the jet pump was analyzed by the commercial software FLUENT. The effect of throat inlet contraction angle on the performance of jet pump is analyzed. It is found that the throat inlet contraction angle between 20 擄and 45 擄has little effect on the efficiency of jet pump. It is also found that cavitation is more likely to occur at the throat entrance than with a small jet pump. 3. Based on the numerical calculation of the jet pump, the working pressure and the ejection pressure of the jet pump with the cross section ratio of 6-11 are analyzed. The effect of outlet mixing pressure on its performance and the relationship between suction height and the ratio of discharge pressure to flow rate when the total head of the jet pump is constant. 4. Based on the analysis of internal flow field and performance of jet pump, the performance calculation model of anti-cavitation device based on jet pump is established. At the same time, the operation law of anti-cavitation device under different working conditions is studied.
【學(xué)位授予單位】：大連理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH38

【引證文獻】

相關(guān)碩士學(xué)位論文 前3條

1 韓濤;船舶海水淡化裝置模擬操作系統(tǒng)的研究與開發(fā)[D];大連海事大學(xué);2012年

2 鄧貴華;某蒸汽噴射器的數(shù)學(xué)建模及結(jié)構(gòu)優(yōu)化研究[D];山東建筑大學(xué);2013年

3 蔡勇;疏浚船加氣減阻裝置結(jié)構(gòu)優(yōu)化與特性參數(shù)研究[D];武漢理工大學(xué);2013年

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本文編號：1872265