發(fā)布時間：2018-06-22 22:11

  本文選題：分布式供能系統(tǒng) + 雙透平與四磁盤同軸結(jié)構(gòu)�。� 參考：《華北電力大學(北京)》2016年碩士論文

【摘要】：分布式供能系統(tǒng)以其高效,清潔作為未來能源發(fā)展方向的主體,受到各國的重視。而微小型燃氣輪機作為分布式供能系統(tǒng)的核心部分,成為現(xiàn)代學術(shù)界研究的方向。本文依托于國家科技支撐計劃項目“微型移動式燃氣輪機冷熱電聯(lián)供技術(shù)及示范”,建立新型高速渦輪冷電并供動力軸系實驗臺。對基于氣體軸承支撐的轉(zhuǎn)子軸系進行實驗研究。實驗研究了轉(zhuǎn)子軸向間隙、飛升特性等對軸系穩(wěn)定性的影響。主要內(nèi)容如下：1.搭建了新型高速渦輪冷電并供動力軸系實驗臺,結(jié)合實驗臺原理部分從功能和性能的角度介紹了實驗臺的動力單元、集控單元和主機單元。2.根據(jù)實驗臺動力軸系的結(jié)構(gòu)特性,對其展開實驗研究。首先,對雙透平轉(zhuǎn)子軸系的整體軸向間隙進行靜態(tài)實驗測量。其次,對軸系兩端軸承供以相同的軸承氣供氣壓力,通過測量兩端軸承轉(zhuǎn)子軸向間隙的變化,來探究兩端軸承的阻力特性。最后,進行止推軸承止推性能靜態(tài)實驗。對兩端軸承供給不同的供氣壓力,測得不同供氣壓力下的兩端軸承軸向間隙,進而判斷兩端軸承的止推性能,并得出了不同供氣壓力下軸向間隙數(shù)據(jù),以及兩端軸承軸向間隙相等時的軸承供氣壓力組合,為實驗過程中軸承供氣壓力的調(diào)節(jié),提供借鑒意義。3.根據(jù)軸向靜態(tài)實驗的結(jié)果調(diào)節(jié)兩端軸承的供氣壓力,使兩端軸向間隙變化。分別對左端軸承軸向間隙小于右端、左端軸承軸向間隙大于右端、左端軸承軸向間隙等于右端三種情況下進行一系列的軸系動態(tài)實驗。探究兩端軸承供氣壓力、軸承轉(zhuǎn)子軸向間隙改變時,轉(zhuǎn)子軸系的振動特性,并尋找出靜態(tài)實驗結(jié)果對動態(tài)實驗的指導意義。4.通過運用非線性分析方法對兩個透平與四磁盤同軸結(jié)構(gòu)的轉(zhuǎn)子系統(tǒng)升速過程出現(xiàn)的低頻特性和飛升特性進行了分析,與汽機中的現(xiàn)象進行對比,探究了其軸系本身的特性,并給出一些實驗調(diào)節(jié)措施。并對對實驗室中基于非線性圖譜建立的適用于氣體軸承軸系的非線性振動測試分析方法的有效性在新型高速渦輪冷電并供動力軸系的振動特性及穩(wěn)定性實驗研究中給予了驗證。
[Abstract]:Distributed energy supply system is regarded by many countries as the main body of energy development in the future with its high efficiency and cleanliness. As the core of distributed energy supply system, micro gas turbine has become the research direction of modern academic circles. Based on the national science and technology support project "Micro mobile gas turbine combined cooling and heat supply technology and demonstration", a new high speed turbine cooling and power supply shafting test bench is established in this paper. An experimental study of rotor shafting based on gas bearing support was carried out. The effects of rotor axial clearance and hoisting characteristics on the stability of the shaft system are experimentally studied. The main content is as follows: 1. A new high speed turbo cooling and power supply shafting test bench is built. The power unit, centralized control unit and main engine unit of the test bench are introduced from the point of view of function and performance combined with the principle of the test bench. According to the structural characteristics of the power shafting of the test table, the experimental study is carried out. First, the axial clearance of dual turbine rotor shaft system is measured by static experiments. Secondly, the bearing pressure on the two ends of the shaft system is the same, and the resistance characteristics of the two end bearings are investigated by measuring the change of the axial clearance of the two end bearing rotor. Finally, static test of thrust performance of thrust bearing is carried out. The axial clearance of the two ends bearing under different air supply pressure is measured to judge the thrust performance of the two end bearing, and the axial clearance data under different air supply pressure are obtained. The combination of bearing air supply pressure with equal axial clearance between two ends of bearing provides reference for the adjustment of bearing air supply pressure in the course of experiment. According to the results of axial static experiment, the air supply pressure of the two ends bearing is adjusted to change the axial clearance at both ends. A series of dynamic experiments were carried out under three conditions: the axial clearance of the left bearing is less than the right end, the axial clearance of the left end is greater than the right end, and the axial clearance of the left end of the bearing is equal to the right end. This paper probes into the vibration characteristics of the rotor shaft system when the air supply pressure at both ends of the bearing is changed and the axial clearance of the bearing rotor changes, and finds out the guiding significance of the static experimental results to the dynamic experiment. By using nonlinear analysis method, the low frequency and flying characteristics of two rotor systems with coaxial structure of four disks and two turbines are analyzed. Compared with the phenomena in steam turbine, the characteristics of shafting itself are explored. Some experimental adjustment measures are also given. The validity of the nonlinear vibration test method for gas bearing shafting based on nonlinear spectrum is verified in the experimental study on the vibration characteristics and stability of a new type of high speed turbine cooling and power supply shafting.
【學位授予單位】：華北電力大學(北京)
【學位級別】：碩士
【學位授予年份】：2016
【分類號】：TM61

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