本文選題：離心壓縮機(jī)　切入點(diǎn)：變工況　出處：《天津大學(xué)》2012年碩士論文　論文類型：學(xué)位論文

【摘要】：在離心壓縮機(jī)基本級(jí)的損失預(yù)估過程中,應(yīng)較全面考慮葉輪、擴(kuò)壓器等各個(gè)元件中的所有流動(dòng)損失,并建立損失模型,如:葉片表面摩擦損失、葉片載荷損失、間隙損失、尾跡混流損失、回流損失以及擴(kuò)壓器內(nèi)流動(dòng)損失等。 本文在已有的離心壓縮機(jī)變工況性能預(yù)測(cè)基礎(chǔ)上,建立貼近真實(shí)情況的損失模型,選擇貼近真實(shí)情況的修正參數(shù)計(jì)算公式,運(yùn)用FORTRAN語言和VISUAL BASIC語言編寫程序進(jìn)行離心葉輪變工況氣動(dòng)性能計(jì)算處理。運(yùn)用已有的離心壓縮機(jī)最佳工況點(diǎn)的數(shù)據(jù)參數(shù)作為變工況程序的初始值,給定變轉(zhuǎn)速的數(shù)值及個(gè)數(shù),得到變轉(zhuǎn)速變流量條件下的氣動(dòng)參數(shù)值,最終得到某轉(zhuǎn)速下的性能曲線,程序還可以預(yù)測(cè)喘振與阻塞現(xiàn)象發(fā)生點(diǎn),為壓縮機(jī)的安全運(yùn)行提供保障。 采用Eckardt經(jīng)典葉輪進(jìn)行離心壓縮機(jī)變工況性能預(yù)測(cè)程序的準(zhǔn)確性驗(yàn)證。運(yùn)用計(jì)算軟件,生成葉輪和無葉擴(kuò)壓器幾何模型,計(jì)算得到變工況條件下的性能參數(shù)等值,然后運(yùn)行本文編制程序,得到變工況條件下的性能參數(shù)及氣動(dòng)性能曲線。通過對(duì)比兩者變工況條件下的整機(jī)效率、葉輪效率以及壓比等參數(shù),分析預(yù)測(cè)值與實(shí)驗(yàn)值之間的誤差程度與影響原因。 由于目前離心壓縮機(jī)性能預(yù)測(cè)方法主要采用由實(shí)驗(yàn)結(jié)果歸納得到的關(guān)系式,不可避免造成性能預(yù)測(cè)數(shù)據(jù)與真實(shí)值之間一定范圍內(nèi)的差距。本文變工況計(jì)算程序也是一個(gè)需要不斷驗(yàn)證的過程,需要結(jié)合更多更豐富的數(shù)值與實(shí)驗(yàn)結(jié)果不斷完善計(jì)算方法與修正參數(shù)。本文意義在于在設(shè)計(jì)階段基本了解壓縮機(jī)的性能情況,在離心壓縮機(jī)的總體設(shè)計(jì)中縮短設(shè)計(jì)的周期,提高設(shè)計(jì)的效率。
[Abstract]:In the process of estimating the loss of basic stage of centrifugal compressor, all flow losses in impeller, diffuser and other components should be considered comprehensively, and a loss model should be established, such as: loss of friction on blade surface, loss of load on blade, loss of clearance, etc. Wake mixed flow loss, reflux loss and flow loss in diffuser. On the basis of the performance prediction of centrifugal compressor under different working conditions, this paper establishes a loss model close to the real situation, and selects the formula for calculating the modified parameters close to the real situation. The FORTRAN and VISUAL BASIC programs are used to calculate and process the aerodynamic performance of centrifugal impeller under different working conditions. The data parameters of the best working point of centrifugal compressor are used as the initial value of the program, and the value and number of variable speed are given. The aerodynamic parameters under the condition of variable rotational speed and variable flow rate are obtained, and the performance curve at a certain speed is obtained. The program can also predict the occurrence point of surge and blockage, which provides a guarantee for the safe operation of the compressor. The Eckardt classic impeller is used to verify the accuracy of the program for predicting the performance of centrifugal compressor under different working conditions. The geometric model of impeller and vaneless diffuser is generated by using the calculation software, and the equivalent of performance parameters under the condition of variable working condition is obtained. Then run the program in this paper to get the performance parameters and aerodynamic performance curves under the condition of variable working conditions. By comparing the whole machine efficiency, the impeller efficiency and the pressure ratio, etc. The degree of error between the predicted value and the experimental value and the cause of its influence are analyzed. As the current centrifugal compressor performance prediction methods are mainly based on the experimental results summarized from the relationship, It is inevitable to cause the gap between the performance prediction data and the real value in a certain range. The off-condition calculation program in this paper is also a process that needs to be continuously verified. It is necessary to combine more and more abundant numerical and experimental results to improve the calculation method and the revised parameters. The significance of this paper is to understand the performance of the compressor in the design stage and to shorten the design period in the overall design of the centrifugal compressor. Improve the efficiency of the design.
【學(xué)位授予單位】：天津大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH452

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