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Your search keyword '"Huang, X.Q."' showing total 121 results
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121 results on '"Huang, X.Q."'

8. Experimental and computational study of oscillating turbine cascade and influence of part-span shrouds

Author

Huang, X.Q., He, L., and Bell, David K.

Subjects
Fluid dynamics -- Research, Oscillation -- Research, Turbines -- Mechanical properties, Engineering and manufacturing industries, Science and technology
Abstract

This paper presents a combined experimental and computational study of unsteady flows in a linear turbine cascade oscillating in a three-dimensional bending/flapping mode. Detailed experimental data are obtained on a seven-bladed turbine cascade rig. The middle blade is driven to oscillate and oscillating cascade data are obtained using an influence coefficient method. The numerical simulations are performed by using a 3D nonlinear time-marching Navier-Stokes flow solver. Single-passage domain computations for arbitrary interblade phase angles are achieved by using the Fourier shape correction method. Both measurements and predictions demonstrate a fully 3D behavior of the unsteady flows. The influence of the aerodynamic blockage introduced by part-span shrouds on turbine flutter has been investigated by introducing flat plate shaped shrouds at 75% span. In contrast to practical applications, in the present test configuration, the mode of vibration of the blades remains unchanged by the introduction of the part-span shroud. This allows the influence of the aerodynamic blockage introduced by the part-span shroud to be assessed in isolation from the change in mode shape. A simple shroud model has been developed in the computational solver. The computed unsteady pressures around the shrouds are in good agreement with the experimental data, demonstrating the validity of the simple shroud model. Despite of notable variations in local unsteady pressures around the shrouds, the present results show that the blade aerodynamic damping is largely unaffected by the aerodynamic blockage introduced by part-span shrouds. [DOI: 10.1115/1.3111254]

Published
2009

13. Analysis of QTLs for yield components, agronomic traits, and disease resistance in an advanced backcross population of spring barley

Author

Li, J.Z., Huang, X.Q., Heinrichs, F., Ganal, M.W., and Roder, M.S.

Subjects
Barley -- Research, Barley -- Genetic aspects, Biological sciences
Abstract

Abstract: Hordeum vulgare subsp. spontaneum, the wild progenitor of barley, is a potential source of useful genetic variation for barley breeding programs. The objective of this study was to map [...]

Published
2006

36. Hydrology and flow forecasting

Author

Vrijling, J.K., Kwadijk, J., Van Duivendijk, J., Van Gelder, P., Pang, H., Rao, S.Q., Wang, G.Q., and Huang, X.Q.

Abstract

We have studied and applied the statistic model (i.e. MMC) and hydrological models to Upper Yellow River. This report introduces the results and some conclusions from the model. The three models, MMC, MWBM and NAM, have be applied in the research area. The forecasted discharge by the three models are closed to the recorded in most low flow months, but in some flood months, the forecasted value is much different with recorded one. And forecasted accuracy by MWBM nearly matches with that by NAM model. Statistical results indicate that the three models have big forecasted errors in 1989, average relative errors in the year are all excess 60%. In the other four years, MWBM and NAM models have similar forecasted errors; average relative forecasting errors fall in the range from 15% to 55%. For MMC method, average relative forecasted error in 1987 is in smallest value of 23.5% and that in 1990 is in highest value of 102.8%). Forecasted errors in the first two years are relative lower than that in the rest three years, it has increasing trendy. If acceptable forecasted result is that, relative error is less than 20% or absolute error is less than 4mm, then acceptable percentage of forecasted discharge was also calculated. Result shows that most forecasted value by MWBM and NAM is qualified. For MMC method, only in the first two years and low flow period of other years, most forecasted value is acceptable. Forecasted results by MWBM and NAM are all based on given historical meteorological data. But in real time flow forecasting, forecasting accuracy is mainly up to two factors, one is the hydrological model accuracy and the other is the meteorological forecasting accuracy. And conclusions obtained mainly reflect the first factor. In addition, in flow forecasting with the statistic method, (i.e. the MMC method), long series are mostly needed. However, 40 years is a reasonable long period of data. The forecasted error in this case is mainly due to not using the rainfall data. All of results denoted that the three models can be used to forecast discharge in the next one or two years. If meteorological data in the future can be forecasted for a longer period and are of high quality, MWBM and NAM should be adopted first.

Published
2002

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