本文選題：離心通風(fēng)機(jī) + 載荷法��； 參考：《上海交通大學(xué)》2011年碩士論文

【摘要】：控制載荷法是一種通過(guò)控制葉片表面載荷分布方式來(lái)設(shè)計(jì)葉片型線(xiàn)的方法。壓力面與吸力面相對(duì)速度不同,二者的差值稱(chēng)為葉片載荷,通過(guò)控制壓力面和吸力面的相對(duì)速度或者是其他可以表征載荷分布的物理量的分布即可視為對(duì)葉片表面載荷分布的調(diào)整。 離心通風(fēng)機(jī)常用的葉型主要有單板葉片與中空機(jī)翼型葉片。二者相比,中空機(jī)翼型葉片氣動(dòng)性能好,效率高,但是結(jié)構(gòu)相對(duì)復(fù)雜,加工制造成本高,且在空氣中雜質(zhì)顆粒較多的情況下,葉片容易磨損出現(xiàn)漏洞,導(dǎo)致外界雜質(zhì)進(jìn)入葉片內(nèi)部使葉輪轉(zhuǎn)動(dòng)失衡,影響風(fēng)機(jī)安全穩(wěn)定運(yùn)行。單板葉型雖然氣動(dòng)性能相對(duì)略低,但是在制造成本、運(yùn)行穩(wěn)定性方面具有明顯優(yōu)勢(shì)。 本文以4-72型離心通風(fēng)機(jī)為原型,首先,利用商業(yè)流體計(jì)算軟件對(duì)原機(jī)翼型葉片葉輪組進(jìn)行全工況范圍內(nèi)數(shù)值模擬,并分析模擬結(jié)果,得到其基本的流場(chǎng)特性與性能曲線(xiàn),發(fā)現(xiàn)其流動(dòng)損失主要是集中在靠近輪蓋側(cè)的端部損失。然后,在給定工況下,采用控制載荷法設(shè)計(jì)出不同載荷加載方式下的單板葉型,并對(duì)其流場(chǎng)進(jìn)行數(shù)值模擬,通過(guò)對(duì)結(jié)果的對(duì)比分析,表明針對(duì)該風(fēng)機(jī),載荷前加載方式所設(shè)計(jì)的葉型可以獲得性能更好的效率和壓升。同時(shí)將載荷前加載分布方式下所設(shè)計(jì)的單板葉片的模擬結(jié)果與原機(jī)翼型葉片葉輪數(shù)值模擬結(jié)果進(jìn)行詳細(xì)對(duì)比,結(jié)果證明,在不改變風(fēng)機(jī)葉輪組輪盤(pán)、輪蓋外形和葉片數(shù)目的前提下,利用控制載荷法可以設(shè)計(jì)出氣動(dòng)性能達(dá)到原中空機(jī)翼型葉片標(biāo)準(zhǔn)的離心風(fēng)機(jī)等厚度單板葉片,且由于單板葉片其本身結(jié)構(gòu)特點(diǎn),避免了中空機(jī)翼型葉片因磨損而導(dǎo)致葉片破損從而產(chǎn)生葉輪組轉(zhuǎn)動(dòng)失衡的狀況。
[Abstract]:The control load method is a method to design the blade profile by controlling the load distribution on the blade surface. The relative velocities of pressure surface and suction surface are different. The difference between them is called blade load. By controlling the relative velocity of the pressure surface and suction surface or the distribution of other physical quantities which can characterize the load distribution, it can be regarded as the adjustment of the load distribution on the blade surface. The main blade types of centrifugal fan are veneer blade and hollow wing blade. Compared with the latter, the hollow wing blade has good aerodynamic performance and high efficiency, but the structure is relatively complex, the manufacturing cost is high, and the blade is prone to wear and tear loopholes when there are more impurity particles in the air. The impurity enters the blade and causes the impeller to rotate out of balance, which affects the safe and stable operation of the fan. Although the aerodynamic performance of veneer blade is relatively low, it has obvious advantages in manufacturing cost and operation stability. In this paper, the 4-72 centrifugal fan is used as the prototype. Firstly, the commercial fluid calculation software is used to simulate the blade impeller set of the original airfoil in the whole operating condition, and the simulation results are analyzed, and the basic flow field characteristics and performance curves are obtained. It is found that the flow loss is mainly located near the end of the wheel cover. Then, under given working conditions, the veneer blade profile under different load loading modes is designed by using the control load method, and the flow field is numerically simulated. The comparison and analysis of the results show that, The blade profile designed by loading before loading can achieve better efficiency and pressure rise. At the same time, the simulation results of the veneer blades designed under the load pre-loading distribution mode are compared in detail with the numerical simulation results of the original airfoil blade impeller. The results show that, without changing the fan impeller group wheel, On the premise of the shape of the wheel cover and the number of blades, the centrifugal fan blades of equal thickness with aerodynamic performance up to the standard of the hollow wing blade can be designed by using the control load method, and because of the structural characteristics of the veneer blade itself, The wear of the hollow wing blade leads to the breakage of the blade, which leads to the rotating imbalance of the impeller group.
【學(xué)位授予單位】：上海交通大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2011
【分類(lèi)號(hào)】：TH432

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前2條

1 蘇鵬;多級(jí)離心式壓縮機(jī)故障停機(jī)反轉(zhuǎn)特性研究[D];上海交通大學(xué);2012年

2 謝曉冰;超低比轉(zhuǎn)數(shù)離心鼓風(fēng)機(jī)的實(shí)驗(yàn)研究和數(shù)值模擬[D];上海交通大學(xué);2012年

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本文編號(hào)：1831250