本文選題：動葉可調(diào)軸流風(fēng)機　切入點：優(yōu)化設(shè)計　出處：《北京建筑大學(xué)》2013年碩士論文　論文類型：學(xué)位論文

【摘要】：在日常生活及工業(yè)生產(chǎn)中，通風(fēng)機的應(yīng)用非常廣泛，但耗電量也是非常之大的，僅工業(yè)用通風(fēng)機的耗電量就占全國總用電量的12%。我國風(fēng)機制造水平和發(fā)達國家還有差距，風(fēng)機效率還有提高的空間。同時，通風(fēng)機又是生產(chǎn)和日常生活中一個重要的噪聲源。在提倡節(jié)能環(huán)保的大環(huán)境下，通風(fēng)機節(jié)能、降噪的研究已引起高度重視。許多學(xué)者也在節(jié)能、降噪方面做了大量研究。本文在前人對軸流風(fēng)機研究的基礎(chǔ)上，分析了軸流通風(fēng)機的優(yōu)化設(shè)計現(xiàn)狀及設(shè)計中存在的問題，提出了帶后導(dǎo)葉的動葉可調(diào)軸流風(fēng)機的優(yōu)化設(shè)計方法。文中采用了雙工況實例動葉可調(diào)軸流風(fēng)機為原始數(shù)據(jù)，并采取一些手段驗證優(yōu)化結(jié)果的可行性。 主要研究內(nèi)容及結(jié)果如下： 1、建立了帶后導(dǎo)流器的動葉可調(diào)軸流通風(fēng)機的優(yōu)化數(shù)學(xué)模型，即葉片安裝角度改變時（雙工況條件下）效率和噪聲綜合目標函數(shù)；選取葉輪直徑、輪轂比、葉片數(shù)、升力系數(shù)、轉(zhuǎn)速5個參數(shù)作為設(shè)計變量，其中包括了離散型和連續(xù)型兩類設(shè)計變量；選用葉片安裝角度、輪轂處動力負荷系數(shù)、葉柵稠度、許用安全系數(shù)作為優(yōu)化的狀態(tài)變量。在優(yōu)化過程中考慮了葉片載荷對風(fēng)機的影響，在最優(yōu)結(jié)果中可以得到適合兩個工況的最佳葉片安裝角度。 2、采用ANSYS-APDL語言編寫優(yōu)化程序，對建立的風(fēng)機優(yōu)化數(shù)學(xué)模型進行優(yōu)化迭代。得到優(yōu)化后的風(fēng)機結(jié)構(gòu)參數(shù)，同時確定了動葉可調(diào)軸流風(fēng)機運行時的最佳葉片安裝角度。經(jīng)過優(yōu)化后風(fēng)機的效率得到了提高，并降低了它的運行噪聲。 3、利用優(yōu)化后動葉可調(diào)軸流風(fēng)機的結(jié)構(gòu)參數(shù)，在Pro/E中建立風(fēng)機葉輪及后導(dǎo)葉三維模型。 4、在Workbench的Static Structural（ANAYS）模塊對風(fēng)機葉片進行了靜力分析，得到葉片的位移、應(yīng)力、應(yīng)變云圖，，最大值均在材料許可范圍內(nèi)，符合風(fēng)機的安全運行要求。 5、在Workbench的Modal（ANAYS）模塊對風(fēng)機葉輪進行模態(tài)分析，結(jié)果表明，實例風(fēng)機各階固有頻率和激振頻率以及其倍數(shù)值之間的偏差均在15%（即0.15）以上，激振頻率和風(fēng)機固有頻率之間的偏差符合要求，風(fēng)機運行時不會發(fā)生共振，能安全運行。 6、采用Workbench中的Fluent流體分析模塊對優(yōu)化后風(fēng)機進行流場分析，結(jié)果表明，風(fēng)機內(nèi)部流場順暢。
[Abstract]:In daily life and industrial production, the application of fan is very extensive, but the power consumption is very large, only the industrial power consumption of fan accounts for the country's total electricity consumption 12%. Chinese wind turbine manufacturing level and developed countries as well as the gap between the fan efficiency and improve space. At the same time, ventilation the machine is an important noise source in production and daily life. In the promotion of energy conservation and environmental protection of the environment, energy saving ventilator, noise reduction research has aroused great attention. Many scholars have done a lot of research on the energy saving and noise reduction. Based on the previous research on axial flow fan, analysis there are optimum design status and design of axial fan in problem, put forward with the guide moving blade adjustable axial fan optimization design method of the double case moving blade adjustable axial fan for the raw data, and take some measures Verify the feasibility of the optimization results.
The main contents and results are as follows:
1, set up after the belt deflector blades can be optimized mathematical model of flow fan shaft is adjustable, blade installation angle changes (double conditions) efficiency and noise comprehensive objective function; selection of impeller diameter, hub ratio, leaf number, lift coefficient, speed 5 parameters as design variables, including the two class of discrete and continuous design variables; the blade installation angle, hub power load coefficient, cascade solidity, the allowable safety coefficient as the state variables in the optimization process optimization. Considering the influence of blade load on the wind turbine blades, can get the best for two working conditions in the optimal installation angle the results.
2, the use of ANSYS-APDL language optimization program, to establish the mathematical model of wind turbine wind machine structure optimization iteration. The optimized parameters, and determine the optimum blade moving blade adjustable axial flow fan running the installation angle. After optimization of the fan efficiency is improved, and reduces the operation the noise of it.
3, the three-dimensional model of the fan impeller and the rear guide blade is established in Pro/E by optimizing the structural parameters of the adjustable axial fan.
4, in Workbench's Static Structural (ANAYS) module, the static analysis of fan blades is carried out, and the displacement, stress and strain nephogram of the blades are obtained. The maximum values are within the permitted scope of materials, which is consistent with the safe operation requirements of fans.
In 5, Workbench Modal (ANAYS) module for modal analysis of the fan impeller. The results show that the deviation between the instance fan of the natural frequencies and vibration frequency and its numerical times were 15% (0.15) above, the deviation between the excitation frequency and the natural frequency of the fan to meet the requirements, fan the operation does not occur when the resonance, can run safely.
6, the flow field of the optimized fan is analyzed by the Fluent fluid analysis module in Workbench. The results show that the flow field in the fan is smooth.

【學(xué)位授予單位】：北京建筑大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2013
【分類號】：TU834.41

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