| || Hydraulic analogy for isentropic flow through a Nozzle
Author : Seshadri, V. ;Rao, V.V.R.;Rao, J.S.
Source : Defence Science Journal ; Vol:33(2) ; 1983 ; pp 97-111
Subject : 532.5 Hydrodynamics;532 Fluid Mechanics
Keywords : Nozzle ;Hydraulic Analogy;Modelling Aspects
Abstract : Modelling aspects of isentropic compressible gas flow using hydraulic analogy are discussed. subsonic and supersonic flow through a typical nozzle are simulated as free surface incompressible water flow in an equivalent 2-D model on a water table. The results are first compared for the well known classical analogy in order to estimate experimental errors. Correction factors for pressure and temperature, to account for non ideal compressible gas flow are presented and the results obtained on the water table are modified and compared with gas dynamic solution. Within the experimental errors, it is shown that the hydraulic analogy can be used as an effective tool for the study of two dimensional isentropic flows of gases.
| || Rotating Water Table for the Determination of Non-Steady Forces in a Turbine Stage Through Modified Hydraulic Analogy
Author : Rao, V.V.R. ;Seshadri, V.;Raghavacharyulu, E.;Rao, J.S.
Source : Defence Science Journal ; Vol:33(4) ; 1983 ; pp 273-288
Subject : 532.5 Hydrodynamics
Keywords : Modified hydraulic analogy ;Hydraulic analogy
Abstract : Determination of non-steady forces in a real turbine stage is difficult due to the local flow conditions, for example high pressures, high temperatures and in-accessibility to the region etc. Experimentation in a real turbine is also prohibitive due to the costs involved. An alternate method of arriving at these non-steady forces through the use of modified hydraulic analogy is discussed. A rotating water table facility, developed and fabricated based on the principles of modified hydraulic analogy is described. A flat plate stage is simulated on the rotating water table, and the results obtained are presented.