52 research outputs found
An analysis of the factors that affect the exhaust process of a four-stroke-cycle reciprocating engine
Effect of blade-thickness taper on axial-velocity distribution at the leading edge of an entrance rotor-blade row with axial inlet, and the influence of this distribution on alignment of the rotor blade for zero angle of attack
Design of two-dimensional channels with prescribed velocity distributions along the channel walls II : solution by Green's function
Design of two-dimensional channels with prescribed velocity distribution along the channel walls I : relaxation solutions
Two-dimensional compressible flow in turbomachines with conic flow surfaces
A general method of analysis is developed for two-dimensional, steady, compressible flow in stators or rotors of radial and mixed flow turbomachines with conic flow surfaces (surfaces of right circular cones generated by center line of flow passage in the axial-radial plane). The variables taken into account are: (1) tip speed of the rotor, (2) flow rate, (3) blade shape, (4) variation in passage height with radius, (5) number of blades, and (6) cone angle of the flow surface. Relaxation methods are used to solve the nonlinear differential equation for the stream function. Two numerical examples are presented; one for compressible and the other for incompressible flow in a centrifugal compressor with thin, straight blades. The results of these examples are given by plots of the streamlines, constant velocity-ratio lines, and constant pressure-ratio line
Design of two-dimensional channels with prescribed velocity distributions along the channel walls
A general method of design is developed for two-dimensional unbranched channels with prescribed velocities as a function of arc length along the channel walls. The method is developed for both compressible and incompressible, irrotational, nonviscous flow and applies to the design of elbows, diffusers, nozzles, and so forth. In part I solutions are obtained by relaxation methods; in part II solutions are obtained by a Green's function. Five numerical examples are given in part I including three elbow designs with the same prescribed velocity as a function of arc length along the channel walls but with incompressible, linearized compressible, and compressible flow. One numerical example is presented in part II for an accelerating elbow with linearized compressible flow, and the time required for the solution by a Green's function in part II was considerably less than the time required for the same solution by relaxation methods in part I
One-dimensional Compressible Flow in Vaneless Diffusers of Radial- and Mixed-flow Centrifugal Compressors, Including Effects of Friction, Heat Transfer and Area Change
A rapid approximate method for determining velocity distribution on impeller blades of centrifugal compressors
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