新型流道式排污泵汽蝕性能研究
發(fā)布時間：2018-11-10 22:57
【摘要】：新型流道式排污泵是國內(nèi)某泵企為適應(yīng)市場需求研發(fā)的污水泵,由于采用的是一種新式葉輪結(jié)構(gòu),其水力性能以及汽蝕性能尚未明確。本文的主要工作和取得的成果如下:1.根據(jù)已有葉輪與蝸殼的結(jié)構(gòu)尺寸,設(shè)計了試驗所需的汽蝕筒、試驗泵段、管路系統(tǒng)等,完成了電機、扭矩儀、真空泵、流量計、壓力傳感器等儀器儀表的選型,最終裝配搭建了符合試驗標準的新型流道式排污泵閉式汽蝕試驗臺。2.在搭建完成的閉式汽蝕試驗臺上進行泵的性能試驗,并通過重復(fù)試驗驗證了設(shè)計試驗臺的可靠性,其最高效率點參數(shù)達到了設(shè)計點的要求,額定點參數(shù)為流量260m3/h,揚程5.5m,功率5.8kW,效率70.9%。通過抽真空法逐步降低水泵進口壓力完成泵的汽蝕試驗,作出了各流量下的H-NPSHa曲線以及泵的汽蝕性能曲線,得到額定流量下的臨界汽蝕余量為8.41m。3.運用ANSYS CFX軟件對新型流道式排污泵進行了外特性數(shù)值計算以及汽蝕性能模擬,數(shù)值模擬結(jié)果均與試驗結(jié)果相吻合,通過分析壓力云圖可發(fā)現(xiàn)葉輪表面有三處低壓區(qū),分別為葉片進口工作面與前蓋板連接處、葉片進口背面中部以及葉片背面近出口處,葉輪表面氣相分布證實了壓力分布的正確性,該三處區(qū)域分別為氣泡的初生點、次生點與季生點。4.設(shè)置四個不同位置監(jiān)測點,分別采集不同汽蝕程度下的壓力脈動信號,并對其進行時域和頻域分析,可發(fā)現(xiàn)隨著汽蝕余量的不斷降低,各監(jiān)測點轉(zhuǎn)頻處振幅均呈現(xiàn)總體上升趨勢,但在臨界汽蝕余量處出現(xiàn)小幅下降的拐點,并且出口處的振幅增長最為明顯,說明通過出口轉(zhuǎn)頻處振幅變化率來進行新型流道式排污泵的汽蝕故障診斷較為可靠。當出口轉(zhuǎn)頻處振幅增長率達到50.79%時,可判定該型流道式排污泵產(chǎn)生汽蝕。
[Abstract]:A new type of flow-channel sewage pump is developed by a pump enterprise in China to meet the needs of the market. Because of the new impeller structure, its hydraulic performance and cavitation performance are not clear. The main work and achievements are as follows: 1. According to the structure size of impeller and volute, the cavitation cylinder, test pump section, pipe system and so on are designed, and the type selection of motor, torque instrument, vacuum pump, Flowmeter, pressure sensor and other instruments are completed. Finally, the closed cavitation test bench of a new type of flow-channel sewage pump was built up in accordance with the test standard. 2. The pump performance test was carried out on a closed cavitation test rig, and the reliability of the designed test rig was verified by repeated tests. The maximum efficiency point parameters reached the requirements of the design point, and the rated point parameters were 260 m3 / h. The head is 5.5 m, the power is 5.8 kW, and the efficiency is 70.9. The cavitation test of the pump was completed by gradually lowering the inlet pressure of the pump by vacuum pumping method. The H-NPSHa curves and the cavitation performance curves of the pump were made under each flow rate. The critical cavitation margin of the pump at rated flow rate was 8.41 m.3. The numerical calculation of external characteristics and cavitation performance of a new type of flow-channel sewage pump is carried out by using ANSYS CFX software. The results of numerical simulation are in agreement with the experimental results. By analyzing the pressure cloud diagram, it can be found that there are three low-pressure regions on the impeller surface. The gas distribution on the surface of the impeller confirms the correctness of the pressure distribution, and the three regions are the primary points of bubble, respectively, where the inlet face of the blade is connected with the front cover plate, the middle part of the back of the blade inlet and the back of the blade near the outlet. Secondary and seasonal points. 4. By setting up four monitoring points in different positions, collecting the pressure pulsation signals under different cavitation degrees, and analyzing them in time domain and frequency domain, it can be found that with the decrease of cavitation margin, The amplitudes of each monitoring point showed an overall upward trend, but a slight decrease occurred at the critical cavitation margin, and the amplitude at the exit increased most obviously. It is proved that the cavitation fault diagnosis of a new type of sewage pump is reliable by the amplitude change rate at the outlet. When the amplitude growth rate of the outlet turn frequency reaches 50.79, the cavitation of this type of drain pump can be determined.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703.3
本文編號：2323804
[Abstract]:A new type of flow-channel sewage pump is developed by a pump enterprise in China to meet the needs of the market. Because of the new impeller structure, its hydraulic performance and cavitation performance are not clear. The main work and achievements are as follows: 1. According to the structure size of impeller and volute, the cavitation cylinder, test pump section, pipe system and so on are designed, and the type selection of motor, torque instrument, vacuum pump, Flowmeter, pressure sensor and other instruments are completed. Finally, the closed cavitation test bench of a new type of flow-channel sewage pump was built up in accordance with the test standard. 2. The pump performance test was carried out on a closed cavitation test rig, and the reliability of the designed test rig was verified by repeated tests. The maximum efficiency point parameters reached the requirements of the design point, and the rated point parameters were 260 m3 / h. The head is 5.5 m, the power is 5.8 kW, and the efficiency is 70.9. The cavitation test of the pump was completed by gradually lowering the inlet pressure of the pump by vacuum pumping method. The H-NPSHa curves and the cavitation performance curves of the pump were made under each flow rate. The critical cavitation margin of the pump at rated flow rate was 8.41 m.3. The numerical calculation of external characteristics and cavitation performance of a new type of flow-channel sewage pump is carried out by using ANSYS CFX software. The results of numerical simulation are in agreement with the experimental results. By analyzing the pressure cloud diagram, it can be found that there are three low-pressure regions on the impeller surface. The gas distribution on the surface of the impeller confirms the correctness of the pressure distribution, and the three regions are the primary points of bubble, respectively, where the inlet face of the blade is connected with the front cover plate, the middle part of the back of the blade inlet and the back of the blade near the outlet. Secondary and seasonal points. 4. By setting up four monitoring points in different positions, collecting the pressure pulsation signals under different cavitation degrees, and analyzing them in time domain and frequency domain, it can be found that with the decrease of cavitation margin, The amplitudes of each monitoring point showed an overall upward trend, but a slight decrease occurred at the critical cavitation margin, and the amplitude at the exit increased most obviously. It is proved that the cavitation fault diagnosis of a new type of sewage pump is reliable by the amplitude change rate at the outlet. When the amplitude growth rate of the outlet turn frequency reaches 50.79, the cavitation of this type of drain pump can be determined.
【學(xué)位授予單位】：合肥工業(yè)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2017
【分類號】：X703.3
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