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Research on product value of wheel diameter and rotational speed — A new design parameter for micro radial turbines

Fu L., Li G.

Archives of Civil and Mechanical Engineering

2017

Vol. 17, no. 2

231--239

The physical realizability is the primarily consideration in micro radial turbine design. The determination of realizability mainly depends on the physical size (wheel diameter) and operation condition (rotational speed). In the past design, the product value of wheel diameter (D) and rotational speed (N) was taken as design result, but this value would lead repeating works because it may not appropriate for the realizability of micro radial turbine. This paper takes DN value as a design parameter to help the micro radial turbine design directly. The analysis of matching relationship between stage velocity ratio and degree of reaction was studied firstly. The influence of matching effects was investigated secondly. Then the DN value was presented and the theoretical research for optimal value selection was conducted thirdly. Compared with the other design parameters, the DN value can reflect the effect of efficiency, wheel size, rotational speed and design working condition directly and the effect of wheel material, structure style, shafting and bearings type directly. So the DN value is a highly concentrated and useful parameter for micro radial turbines. Some aerodynamic and structure parameters of micro radial turbine will be facilitated and designed by using the method of this paper.

Eksperymentalne badania weryfikacyjne wyznaczania średnicy koła pojazdu będącego w ruchu

Kosmol J., Maloszek A.

Prace Naukowe Katedry Budowy Maszyn / Politechnika Śląska

2011

nr 2

29-36

W artykule przedstawiono wyniki badań eksperymentalnych wyznaczania średnicy koła pojazdu szynowego będącego w ruchu. W badaniach tych uwzględniono zmienność prędkości ruchu oraz błędy kształtu kół testowych, dopatrując się w tym przyczyn niezadowalającej dokładności opracowanej metody Porównanie uzyskanych wyników z wcześniejszymi badaniami pozwala stwierdzić, że nierównomierność prędkości znacząco wpływa na dokładność pomiarowej.

The paper presents results of experimental investigation of wheel diameter the method of diameter determination being in motion. Changeability of speed of the vehicle and errors of shapes of tested wheels were taken in to account thincking that they may be a reason of dissatisfied accuracy of proposed method. Comparison of obtained results and results obtained earlier allows to say that inequality of speed of the vehicle significantly influences on the accuracy of the method of diameter determination.