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Showing 1 to 20 of 51 for “"loss coefficient"”.
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Effects of riblets on the performance of the supersonic through-flow fan cascade blades
… pressure to obtain an overall mass-averaged loss coefficient. The riblet loss coefficient was compared with the loss coefficient of a control test case where an equivalent thickness of smooth material is applied to the blades. Results show that, at the design incidence, the 0.033 mm height …
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Determining appropriate loss coefficients for use in the nozzle-model of a stage-by-stage turbine model
… as it relates to the turbine specific loss coefficients, into the turbine stage component to allow for the development of turbine models capable of predicting turbine performance for various structural changes, anomalies and operating conditions. The development of turbine loss …
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Aerodynamic Performance of a Flow Controlled Compressor Stator Using an Imbedded Ejector Pump
… by measuring the reduction in the total pressure loss coefficient. The experiment was conducted in a linear transonic blowdown cascade wind tunnel. The inlet Mach number for all tests was 0.79, with a Reynolds number based on stator chordlength of 2,000,000. A range of inlet cascade angles was …
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Effects of Free Stream Turbulence on Compressor Cascade Performance
… was the behavior of the measured total pressure loss coefficient with and without generated free-stream turbulence. A staggered cascade of nine airfoils was tested at a range of Mach numbers between 0.59 and 0.88. The airfoils were tested at both the lowest loss level cascade angle and extreme …
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An experimental examination of the effect of trailing edge injection on the aerodynamic performance of gas turbine blades
… the effect of blowing rate on the total pressure loss coefficient, L. Tests were conducted at a variety of save cascade exit Mach numbers ranging from 0.79 to 1.36. Measurements were taken at three locations downstream of the cascade blade trailing edges. The algorithm used to calculate the L from …
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Investigation of Aerodynamic Profile Losses for a Low-Reaction Steam Turbine Blade
… refinement of a proprietary empirical profile loss model. A review of the literature shows that experimental data on this type of blade is not openly available. The continued efficacy of empirical loss models to low-reaction steam turbine blades requires data from experiments such as the …
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Computational Fluid Flow Analysis of the Enhanced-Once through Steam generator Auxiliary feedwater system
… plate. To perform the fluid analysis, the losses in the bypass leakage flow and broached hole leakage flow were first quantified and then used to model a 1/8th sector of the EOTSG. Using user defined functions (UDF), the loss coefficients of the leakage flows were implemented on the 1/8th …
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Effects of Flow Control on the Aerodynamics of a Tandem Inlet Guide Vane
… edge blowing at reducing the blade profile losses and the wake momentum deficit of a cascade of tandem IGV's operating at realistic flow conditions. Two trailing edge blowing designs were tested: metal-angle blowing, which oriented the blowing jets very near to the blade exit angle, and …
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Probabilistic analysis of meanline compressor rotor performance
… variability of the rotor at design flow coefficient and near stall given typical variations in blade profile geometry, hub and casing diameters, and tip clearances. Monte Carlo simulation performed at both operating conditions shows that the coefficient of variation of pressure rise, loss …
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Numerical Loss Prediction of high Pressure Steam Turbine airfoils
… the trailing edge. It was found that the average loss coefficient was low, owing to the fact that the flow over the airfoils was well behaved. The loss coefficient also showed a slight decrease with exit Mach number for all three profiles. The mid radius and tip profiles showed near identical …
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Improved return passages for multistage centrifugal compressors
… baseline return passage is analyzed to identify loss sources that have substantial potential for reduction. For the geometry analyzed, it is found that mismatched incidence of the return vane, separation on the hub surface at the exit of the return bend, and blockage due to separation on the …
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Hypolimnetic Aerators: Predicting Oxygen Transfer and Water Flow Rate
… water velocity by varying the frictional loss coefficient for the air-water separator. An empirical correlation that predicts the loss coefficient as a function of superficial water velocity was obtained. The results of the correlation were similar to those predicted by literature …
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Physically modeling and mathematically simulating pressure transients in transfer lines
… equation was implemented with major and minor losses. The model revealed several aspects of the physical system that were not immediately obvious from the data. The unpredicted aspects of the physical system were the fluctuation in tank pressure over the test duration and the correlation …
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Flow and Heat Transfer in Tubes with Obstacles
… the understanding of heat transfer and pressure loss in heated tubes equipped with flow obstacles by experimentally investigating the axial and circumferential distributions of convective heat transfer in a heated tube, complemented by pressure loss and velocity measurements in an adiabatic pipe …
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Rigorous Design of a Compact, Low-Speed, Open-Loop Wind Tunnel
… the flow non-uniformity and the total pressure loss coefficient throughout the tunnel. The first principles based approach yields a set of components, respecting the constraints set while two-dimensional computations allows the determination of the wind tunnel dimensions and estimation of its …
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An Improved Biosolid Gasifier Model
… temperature profile data. An overall heat loss coefficient was calculated for the gasification unit to provide a more accurate energy balance. Once the model was equipped with a heat loss coefficient, the output syngas temperature closely matched the operational data from the MaxWest …
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Investigation of Inlet Guide Vane Wakes in a F109 Turbofan Engine with and without Flow Control
… and fan. Results showed that the total pressure loss coefficient of the time averaged IGV wake is reduced by 30% for the subsonic fan, and increased by a factor of 2 for the transonic fan compared to the baseline. Time resolved wake profiles for subsonic fan speeds show constructive and …
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The effect of boundary layer blowing in the corner region of a linear compressor cascade wind tunnel
… presented as a series of velocity vector plots, loss contour plots, and pitchwise mass - averaged loss coefficient plots. The angle of attack test range was from 5 to 29 degrees. For the corner region boundary layer blowing investigations, two slots were machined into the ends of a set of cascade …
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Unsteady shock wave effects on transonic turbine cascade performance
… variation. Furthermore, an approximated loss coefficient was determined to fluctuate as much as 40 percent near the blade passage center. Comparisons are made with previously-published experimental and analytical results.
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Analytical methods for evaluating two-dimensional effects in flat-plate solar collectors
… conventional assumption of an overall uniform loss coefficient U<sub>L</sub> was used in the analysis. The first method is practical only for parallel-flow collectors. The second method used two sectionally uniform loss coefficients -- U<sub>LI</sub> for internal collector sections and …
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