本文關(guān)鍵詞： 液體輸送 泵 熱驅(qū)動 數(shù)值計算　出處：《浙江大學(xué)》2016年碩士論文　論文類型：學(xué)位論文

【摘要】：熱驅(qū)動制冷系統(tǒng)中,傳統(tǒng)的純電驅(qū)動泵耗電量高,適應(yīng)性不好；而后出現(xiàn)的利用閥切換來控制液體從低壓側(cè)輸送到高壓側(cè)的方式又不夠方便可靠。本文回顧了通過熱量輸入驅(qū)動流體輸送的研究進(jìn)展及其在制冷系統(tǒng)中的應(yīng)用現(xiàn)狀,在一種利用高壓蒸汽驅(qū)動的液體輸送泵基礎(chǔ)上,對其結(jié)構(gòu)設(shè)計進(jìn)行了優(yōu)化,對樣機(jī)進(jìn)行了加工制造,利用數(shù)值計算方法對其流量特性和輸送過程特點進(jìn)行了分析,并搭建了實驗平臺對其輸送性能進(jìn)行了實驗研究。主要研究及結(jié)論有：1)與低溫?zé)狎?qū)動有機(jī)朗肯循環(huán)發(fā)電帶動傳統(tǒng)電泵的液體輸送能力相對比,流量輸送能力處于同一水平,明確了新型泵的可行性。2)數(shù)值計算結(jié)果顯示,圓形和扇形結(jié)構(gòu)流量隨轉(zhuǎn)速增加先上升后下降,最大流量對應(yīng)轉(zhuǎn)速分別為85r/min、180r/min,且上升段前段呈近似線性變化,處于滿載輸送狀態(tài)；在最大流量對應(yīng)轉(zhuǎn)速附近有一段平穩(wěn)段,說明了新型泵具有較好的平穩(wěn)工作特性；。3)扇形結(jié)構(gòu)相對于圓形結(jié)構(gòu),流量范圍更廣,相應(yīng)的壓力平衡孔性能更好,聚四氟乙烯、玻璃纖維、碳纖維和石墨的復(fù)合材料用來加工轉(zhuǎn)子,可以達(dá)到自密封、抗磨損、摩擦系數(shù)小的綜合性能要求。4)不同高壓壓力下,扇形結(jié)構(gòu)流量隨轉(zhuǎn)速增加都呈現(xiàn)出先上升后下降的變化特點,且在上升段前段呈近似線性變化,處于滿載輸送狀態(tài),與數(shù)值計算相符,且隨著高壓壓力上升,最大流量變小且最大流量對應(yīng)轉(zhuǎn)速變�。�5)不同高壓壓力下,輔助電機(jī)輸入功率隨轉(zhuǎn)速增加而增大,增大速率與高壓壓力成正相關(guān)；隨著高壓壓力上升,輸送性能系數(shù)上升,且在滿載輸送狀態(tài)結(jié)束,轉(zhuǎn)子通道內(nèi)液體質(zhì)量開始減小時,達(dá)到輸送性能系數(shù)的最優(yōu)值,扇形結(jié)構(gòu)新型泵更適合在高壓側(cè)壓力更高的低轉(zhuǎn)速區(qū)間工作。
[Abstract]:In the heat driven refrigeration system, the traditional pure electric drive pump has high power consumption and poor adaptability. However, the subsequent use of valve switching to control the flow of liquid from the low-pressure side to the high-pressure side is not convenient and reliable. This paper reviews the research progress of fluid transportation driven by heat input and its application in the refrigeration system. On the basis of a liquid conveying pump driven by high pressure steam, the structure design of the pump is optimized, the prototype is processed and manufactured, and the characteristics of the flow rate and the conveying process are analyzed by using the numerical calculation method. An experimental platform was set up to study its transport performance. The main research and conclusions are as follows: (1) compared with the liquid transport capacity of low temperature heat driven organic Rankine cycle power generation and traditional electric pump, the flow transport capacity is at the same level. The results of numerical calculation show that the flow rate of circular and sector structure increases first and then decreases with the increase of rotational speed, and the corresponding maximum flow rate is 85r / min ~ 180r / min, respectively, and the front section of the rising section is approximately linear, and it is in the state of full load transportation. There is a stationary section near the corresponding speed of the maximum flow rate, which shows that the new pump has better stationary operating characteristics than the circular structure, the flow range is wider, the corresponding pressure balance hole has better performance, and the PTFE, Composite materials of fiberglass, carbon fiber and graphite are used to process rotors to meet the comprehensive performance requirements of self-sealing, wear resistance, and low friction coefficient. The flow rate of the sector structure increases first and then decreases with the increase of rotational speed, and it is approximately linear at the front of the rising section, and is in the state of full load transportation, which is consistent with the numerical calculation, and increases with the pressure of high pressure. Under different high pressure pressure, the input power of auxiliary motor increases with the increase of speed, and the increasing rate is positively related to the high pressure, and the transport performance coefficient increases with the increase of high pressure. At the end of the full load transportation the liquid mass in the rotor channel begins to decrease to the optimum value of the conveying performance coefficient. The new type of fan structure pump is more suitable for working in the low speed range with higher pressure on the high pressure side.
【學(xué)位授予單位】：浙江大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2016
【分類號】：TB657

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本文編號：1538435