本文關(guān)鍵詞： 葉柵 稠度 沖角 二次流　出處：《東北石油大學(xué)》2015年碩士論文　論文類型：學(xué)位論文

【摘要】：通過改變汽輪機(jī)進(jìn)口導(dǎo)向葉柵的稠度,建立了三種稠度高壓導(dǎo)向葉片柵模型,進(jìn)行了空氣動(dòng)力特性的數(shù)值仿真,并對(duì)原型葉柵的進(jìn)口沖角進(jìn)行了變沖角特性氣動(dòng)性能數(shù)值研究。通過導(dǎo)向葉柵不同稠度和不同沖角的數(shù)值仿真及葉柵流動(dòng)機(jī)理的研究,為國(guó)內(nèi)研制具有獨(dú)立知識(shí)產(chǎn)權(quán)的汽輪機(jī)技術(shù)提供理論支持。通過改變?nèi)~柵的稠度和進(jìn)口氣流沖角,對(duì)數(shù)值仿真結(jié)果進(jìn)行分析總結(jié),具體分析內(nèi)容包括葉型截面靜壓系數(shù)分布規(guī)律、節(jié)距在子午面上平均靜壓系數(shù)分布規(guī)律、總壓損失系數(shù)沿軸向的分布規(guī)律、節(jié)距在葉柵出口處平均總壓損失系數(shù)沿展向分布規(guī)律和總壓在出口橫截面上的分布規(guī)律。對(duì)不同稠度直葉片進(jìn)行了數(shù)值分析,靜壓系數(shù)沿葉型分布表明三種稠度的直葉片在后部加載葉型的特性明顯,靜壓系數(shù)等值線在子午面上的分布表明流道內(nèi)大部分是二維的層流流動(dòng),直到接近尾緣附近才進(jìn)入三維湍流區(qū),湍流區(qū)的大小隨著導(dǎo)向葉柵稠度的增大而增大�？倝簱p失在出口截面的分布表明稠度增加,損失區(qū)尾跡寬度將增大,上、下通道渦對(duì)應(yīng)的損失核心變大。通過變化沖角的數(shù)值仿真,結(jié)果表明：后加載特性的仿真葉片改善了沖角適應(yīng)性,在吸力表面和壓力表面內(nèi)沖角的變化基本沒有改變靜壓在葉片表面的分布,但正沖角卻增加了壓力損失,而負(fù)沖角小幅度減弱壓力損失。通過對(duì)葉柵內(nèi)流場(chǎng)的各氣動(dòng)參數(shù)的分析,在不同沖角作用下,未發(fā)現(xiàn)有氣流擁堵問題；上、下通道渦的變化時(shí),隨葉柵沖角增大而增強(qiáng),帶來的損失相應(yīng)增大,尾跡脫落渦的形狀與之類似,寬度隨葉柵沖角的增大而增加,表明原型葉片柵對(duì)變沖角的適應(yīng)性良好。
[Abstract]:By changing the consistency of turbine inlet guide cascade, three kinds of consistency high pressure guide blade cascade models are established, and the aerodynamic characteristics are numerically simulated. The aerodynamic characteristics of the inlet angle of incidence of the prototype cascade are numerically studied. The flow mechanism of the cascade is studied by numerical simulation of different consistency and angle of incidence of the guide cascade. This paper provides theoretical support for the development of steam turbine technology with independent intellectual property rights in China. The numerical simulation results are analyzed and summarized by changing the cascade consistency and the angle of incidence of inlet airflow. The detailed analysis includes the distribution law of the static pressure coefficient of the blade profile section, the distribution law of the average static pressure coefficient on the meridian plane and the distribution law of the total pressure loss coefficient along the axial direction. The distribution of the average total pressure loss coefficient at the outlet of the cascade and the distribution of the total pressure on the outlet cross section are analyzed numerically. The distribution of the hydrostatic pressure coefficient along the blade profile indicates that the three straight blades with different thicknesses have obvious characteristics of the blade shape at the back, and the distribution of the static pressure coefficient isoline on the meridian surface indicates that most of the flow channels are two-dimensional laminar flow. The size of the turbulent zone increases with the increase of the consistency of the guide cascade. The distribution of the total pressure loss in the exit section indicates that the consistency increases and the wake width of the loss area increases. The loss core corresponding to the lower channel vortex becomes larger. The numerical simulation of the angle of incidence shows that the simulation blade with the afterloading characteristics improves the adaptability of the angle of attack. The variation of the angle of incidence in the suction surface and the pressure surface basically does not change the distribution of static pressure on the blade surface, but the positive angle of incidence increases the pressure loss. The negative angle of incidence weakens the pressure loss by a small margin. By analyzing the aerodynamic parameters of the flow field in the cascade, there is no problem of airflow congestion under different attack angles, and the variation of the vortex in the upper and lower channel increases with the increase of the angle of incidence of the cascade. The loss increases correspondingly and the shape of wake shedding vortex is similar. The width increases with the increase of cascade angle indicating that the prototype blade grid has good adaptability to variable angle of incidence.
【學(xué)位授予單位】：東北石油大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2015
【分類號(hào)】：TK263.62

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