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RISMechanics on the Tip Clearance Loss of Impeller Blades
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: For predicting the tip clearance loss of turbomachines, different equations are published in the literature based on different principles. In 1986 the present author postulated a new theory where ...
Deceleration Rate Parameter and Algebraic Prediction of Turbulent Boundary Layer
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The deceleration rate θ1 /λ, which is defined as the ratio of the momentum thickness to the distance where the free-stream velocity is reduced by 10 percent, is shown as an important and ...
Prediction of Flow Separation in a Diffuser by a Boundary Layer Calculation
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: From a consideration of flow stability, it is shown that the onset of separation in a diffuser depends upon the local blockage factor. Using performance data for two-dimensional diffusers from ...
A Study on Unstable S-Shape Characteristic Curves of Pump Turbines at No-Flow
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: A small model of a Francis-type pump turbine was tested without the rotating shroud and the radial distribution of pressure in the rotor was measured using pressure taps on the stationary ...
Improvement of the Performance of Conical Diffusers by Vortex Generators
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: Vortex generators, which consist of small blades, are applied to conical diffusers the divergence angles of which are 8, 12, 16, 20, and 30 deg, respectively. The area ratio of each diffuser ...
Deterioration of Compressor Performance Due to Tip Clearance of Centrifugal Impellers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The authors’ theory on the tip-clearance loss of centrifugal impellers is modified to include the variation of slip coefficient of the impeller due to the tip clearance, by deriving a rational ...
An Analysis on the Flow in a Casing Induced by a Rotating Disk Using a Four-Layer Flow Model
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: An analytical study has been made to clarify the details of the flow between a rotating disk and a stationary casing side-wall with and without an axisymmetric inward through-flow. The flow ...
Rotating Stall Induced in Vaneless Diffusers of Very Low Specific Speed Centrifugal Blowers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The limit of rotating stall was experimentally determined for three very small specific speed centrifugal blowers. The impellers were specially designed for stall-free at very small flow rates, ...
On the Pressure Losses Due to the Tip Clearance of Centrifugal Blowers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The pressure distribution along the shroud is measured for three types of centrifugal impeller at seven different values of tip clearance each. The change of input power due to a change of ...
Pressure Loss Due to the Tip Clearance of Impeller Blades in Centrifugal and Axial Blowers
Publisher: The American Society of Mechanical Engineers (ASME)
Abstract: The pressure loss based on the tip clearance of impeller blades consists of the pressure loss induced by the leakage flow through the clearance and the pressure loss for supporting fluid ...