low specific speed 中文意思是什麼
low specific speed
解釋
低比速-
Experimental research on low specific speed roto - jet pump
低比轉數旋噴泵的試驗研究 -
The roto - jet pump is a new kind of very low specific speed pump which is developed in recent years. it is always used in carbin black, food production, chemical industry and deep well mining system to supply the steady outflow with low flux and high pressure
旋轉噴射泵是近些年才發展起來的一種極低比轉數泵，主要用在碳黑、食品、化工以及深井采礦系統中用以提供小流量高水頭的穩定出流。 -
The study has completed the design of two - phase inverter and made up of the two - phase inverter - motor system for experimental use it is a variable frequency adjustable speed system with a open - loop control of rotational speed, which consists of voltage - controlled oscillator circulating assign device inverter circuit and two - phase induction motor a accurate mathematical model is set based on the whole system, and simulator program of dynamic and steady condition is established, which is used to calculate the dynamic and steady performance by kron and symmetrical coordinate converter by simulator calculation and experimental research with specific parameter of the system, a comparison is made between predicted and experimental characteristics, experimental measurements are shown to compare closely with corresponding theoretical result it is compared with some variable frequency adjus table speed system comprising inverter and single - phase induction motor from the system efficiency torque pulsation and the effect of two - phase inverter capacitance based on the conclusion, harmonic cancellation pulse width modulation control of a two - phase inverter - fed induction - motor drive system is researched, which cancelled the low harmonic and improve the system performance
通過對電機的kron變換和對稱分量變換，建立了系統較精確的數學模型，編制了系統動態及穩態運行的模擬計算程序分別計算系統的動態和穩態性能。通過對系統的具體參數進行了模擬運算和實驗研究，實驗和模擬結果進行比較，說明實驗和理論較為一致，並從系統效率、轉矩脈動及兩相逆變器電容的影響等方面與各種逆變器和單相異步電動機組成的變頻調速系統加以比較。在此基礎上，對兩相逆變器供電-異步電動機系統使用諧波抑制pwm控制進行了研究，由於減少了低次諧波，改善了系統性能。 -
But there is still a difficult problem present in the low specific speed sewage pumps : with changeable operation points, the motor is often destroyed by overload, which restricts the application of the pump in many fields
但是低比速排污泵在工況多變的場合極易因過載而燒毀電機，這一問題一直沒有得到很好的解決，這大大限制了排污泵的使用范圍。 -
It is a vane pump with high head, small flow and low specific speed, which is smaller, flight and simpler in structure than positive displacement pump mulfistage centrifugal pump, and may handle liquid of high gas or steam content
該泵是一種高揚程，低比速的葉片泵，比容積式泵和多級離心泵體積小、重量輕、機構簡單等優點，並可以輸送氣體或蒸氣含量較輕的液體。 -
Under the premise of ensuring the pump ' s normal performance, and its non - overload characteristics and aimed at lowering the maximum brake horsepower, the author also analysis the problem resulted from the saturation brake horsepower of the low specific speed sewage pumps and the solution to it. 3
推導了排污泵飽和軸功率特性產生的理論條件，導出了無過載排污泵設計的基本方程，在保證泵性能要求的前提下，同時實現無過載要求，討論了低比速排污泵設計中存在的問題及解決的途徑。 -
Comparing tow methods of efficency pre - estimation, it finds out the new method fit for super - low specific - speed pump. acoording to the study and comparison on efficency and reliability, the thesis points out merits and faults of the 5 types of impeller, and draws a conclusion that the complex impeller and partly blocked - flow - passage impeller are fit for the impellers of super - low specific - speed centrifugal pump
比較了泵效率預估的方法，提出了適合於極低比轉數泵效率預估的新方法，並對其性能要求的效率和可靠性兩方面進行了研究比較，指出了五種形式葉輪各自的優缺點，得到結論：復合葉輪和部分堵塞流道的一般葉輪適合作極低比轉數泵葉輪。 -
Design of small - discharge low - specific - speed submersible sewage pump
小流量低比轉速潛水排污泵的設計 -
Super - low specific - speed centrifugal pump is a part of centrifugal pumps, which is widely used in aerospace and petrochemical industries
極低比轉數離心泵（ ns < 30 ）是離心泵的一部分，其在宇航事業和石化工業等領域應用廣泛。 -
According to the distribution of pressure and velocity on the 5 types of impeller, it analyses and discribes the feature of internal flow in super - low specific - speed pump impeller
通過對五種葉輪內流動的模擬比較，描述了極低比轉數葉輪內流動的特點。 -
A new type of very low specific speed pump ? roto - jet pump is presented for low flowrate and high head transportation, which is introduced at the end of the thesis
論文最後主要研究了一種隸屬于極低比轉數離心泵范疇的新型泵? ?旋噴泵，它是一種新型的石油化工用泵，具有流量小、揚程高、流量揚程曲線平緩的特點。 -
This thesis also describes the numerical simulation of three - dimensional turbulent flow in super - low specific - speed impeller, points out the turbulence model and numerical solution for it, and gives the writer ' s view of the grid - generation
論文的另一部分工作是數值模擬極低比轉數泵葉輪內部流動，提出了適合的湍流模型和數值解法，並對網格的劃分提出了自己的看法。 -
In present thesis, the actual design theories and methods for super - low specific - speed pump are introduced first, including " the increased flowrate design method ", " the method of anti - hump on h ~ q characteristic curve ", " non - overload design method ", " the design method of complex impeller " and so on. according to these methods, 5 types of impeller have been designed
論文首先對極低比轉數離心泵的現行設計理論和設計方法作了介紹，包括加大流量設計法、減小或消除揚程曲線駝峰的途徑、無過載設計及復合葉輪設計法等，並按照這些方法設計了五種葉輪。 -
First super - low specific - speed centrifugal pump has a long and narrow flow passage for its high head and low capacity, and the power absorbed by disc friction is too high, so the efficiency is very low ; secondly the diffusion of flow passage is so high, that the reserved flow often emerges at the inlet and outlet of impeller. therefore the h ~ q characteristic curve is often hump - shaped, and at the low - capacity operating condition the instability often occurs ; thirdly the centrifugal pump at high - capacity operating condition is easy to overload because the n ~ q curve appears a rising trend
首先由於它的揚程較高、流量較小，所以它的流道狹長，圓盤摩擦損失較大，效率相對較低；其次由於它的流道擴散較嚴重，易在葉片進口產生迴流和在出口產生脫流，揚程流量特性曲線易出現駝峰，在小流量工況下易產生不穩定現象；第三，由於其功率流量曲線呈現上升趨勢，在大流量區運行時電機易過載。 -
Beacause apon ’ s efficiency is low and epon could not provide quality assurance for real - time services, network inspection, operation management and network control, gpon was proposed by fsan in september 2002, which can provide gigabit speed, high efficiency, transparent transmission of multi - services and specific quality of service. at present, the gpon standards, g. 984. 1, g. 984. 2, g. 984. 3 and g. 984. 4, have been established by itu - t
Fsan組織考慮到apon的低效率和epon的無法對傳送實時業務提供質量保證、缺乏電信級的網路監測和業務管理等方面的不足，於2002年9月提出了具有gbit / s級的高速率、高效率，支持多業務透明傳輸，能夠提供明確的服務質量保證和服務級別，具有電信級的網路監測和業務管理能力的光纖接入網gpon 。 -
By discussing in detail the shapes and types of pump characteristic curves and the effects of geometrical parameters on them, this paper points out that the main reason of the brake horsepower of the low specific speed sewage pump increasing with capacity rapidly is that we often select larger geometrical parameters such as b2, ft and so on to enhance the capacity of the sewage pump
詳細討論了離心式排污泵特性曲線的形狀和種類，以及幾何參數對排污泵特性曲線的影響，指出排污泵設計中增大b _ 2 、 f _ t等幾何參數是導致軸功率曲線隨流量增加上升很快的原因。 -
Td4n low - speed multi - place - carrier autobalancing centrifuge is specific for analysis of urine dreg ， brushless ， no carbon dust ， autobalancing ， high efficacy ， fine separation
Td4n多管架低速尿沉渣低速離心機是尿沉渣分析的專用離心機，具有無碳刷粉塵污染，自動平衡、效率高、分離效果好的特點。 -
On the basis of advanced electric control technology, my works are carry on analysis and design about the hardware and software of ecu. the idle speed control aim is make gasoline keep well property under the low rotation. in accordance with 465q gasoline specific conditions, we take use of fuzzy control theory on idle speed control of gasoline, and make step - motor to idling executive body. appling intel 80c196kb chip, we program idling the main order, software time implement break sub - order and delay sub - order in compilation language
怠速控制的目的則是保證在較低的轉速下保持汽油機具有良好的性能，我們在分析465q汽油機的具體情況的基礎上，把模糊控制理論用在汽油機怠速控制方面，用步進電機作為怠速執行機構，並以intel的80c196kb單片機為主晶元設計了怠速控制系統的軟硬體，用intel匯編語言設計了怠速主程序，軟體定時器中斷服務程序，三相單三拍步進電機正反轉子程序，延時子程序匯編軟體。
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