Study on a New Approach to Blade Section Design and Effects of Its Parameters on Cavitation Characteristics Part Ⅰ: A New Approach to Blade Section Design
This paper gives checking results of 42 Bp1 -1/J and Bp2-1/J diagrams of B-screw series, drawn in NSMB in 1975, with blade numbers ranging from 3 to 7,according to the polynomials of trust and torque coefficients from NSMB,which presents that the lined vertical coordinates,i, e. pitch -diameter ratios,were wrongly made in all the diagrams.
In a discharge passage with a guide blade discharge circulation and secondary flow because of bend pipe, the flow in a 1-channel discharge passage of an axial flow pump is a complicated spiral flow.
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The outlet guide blade with a small discharge circulation or without circulation could reduce discharge passage hydraulic losses and increase pump assembly efficiency by 6%-11%.
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Mobile platform for hydraulic turbine blade repair robot
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The wall-climbing mobile platform (MP) of a robot for repairing a hydraulic turbine blade onsite is developed.
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The platform adheres to the blade surface through the force provided by the ferromagnetic devices, and a certain gap exists between the magnetic devices and the blade's surface.
In this paper, formulas to calculate the lift, drag and moment coefficients of a supereavitating circular arc hydrofoil with zero thickness are derived by using the linearized theory developed by Geurst. Similar to the method used in aerodynamics, we integrate the Cauehy type integral in Geurst solution by means of contour integral, the velocity field of a circular arc hydrofoil can be represented analytically. The complex velocity w(z) is then expended into Laurent series and if the coefficients of the fir...
Because of the influence of the hull, the stern propeller of a twin-screw vessel is working under condition of oblique flow, and the unsteady working condition of the blade of a propeller is created. In this paper a study of the influence of oblique flow on various aspects of the properties of a propeller is described. It has been found that the thruat coefficient and the torque coefficient of a propeller working under condition of oblique flow are increased. If the angle of oblique flow is large, it ...
Formulae for checking the strength of propeller with aerofoil and circular back sections are derived on the basis of analysis and empirical data. In deducing the formula, the thrust and torque force distributions along the blade are calculated by using the theoretical method, while sinθ and cosθ are expressed as the function of H/D. δη, which is taken from the Troost's propeller design chart, is introduced, when torque force is transformed into thrust. Then all the functions connected with H/D are exp...