In this paper both Eulerian and Lagrangian approaches are used on the numericalcomputations of dilute gas-solid two-phase flows. In Eulerian approach the gas flow field in atwo-dimensional tunnel is computed by a gene...In this paper both Eulerian and Lagrangian approaches are used on the numericalcomputations of dilute gas-solid two-phase flows. In Eulerian approach the gas flow field in atwo-dimensional tunnel is computed by a general-used software. From this result the particletrajectory is computed by the model of one-way coupling using the knocking relation obtainedfrom the experiments. The computed result shows good agreement with that produced fromexperimental measurement. In addition, in order to consider the coupling effect between thetwo-phase, a two-way coupling model is also used to compute the particle trajectory, andproduced some useful conclusion. The presented computing program can be used to predictthe trajectory of solid particle in dilute two-phase flow.展开更多
A parameter estimation approach of reconnaissance hybrid radar signal combined frequency-shift keying （FSK） and phase-shift keying （PSK） is presented. Firstly, the multi-phase difference is adopted to calculate th...A parameter estimation approach of reconnaissance hybrid radar signal combined frequency-shift keying （FSK） and phase-shift keying （PSK） is presented. Firstly, the multi-phase difference is adopted to calculate the instantaneous frequency （IF） of FSK/PSK, then the frequency points of FSK are estimated from the histogram of IF. The code rate of PSK is extracted from the locations of phase discontinuity. Finally, the multi-phase difference of the square of the received signal is computed to estimate the code rate of FSK. The presented algorithm has higher accuracy of parameter estimation when the signal-to-noise ratio （SNR） is above 11 dB.展开更多
文摘In this paper both Eulerian and Lagrangian approaches are used on the numericalcomputations of dilute gas-solid two-phase flows. In Eulerian approach the gas flow field in atwo-dimensional tunnel is computed by a general-used software. From this result the particletrajectory is computed by the model of one-way coupling using the knocking relation obtainedfrom the experiments. The computed result shows good agreement with that produced fromexperimental measurement. In addition, in order to consider the coupling effect between thetwo-phase, a two-way coupling model is also used to compute the particle trajectory, andproduced some useful conclusion. The presented computing program can be used to predictthe trajectory of solid particle in dilute two-phase flow.
基金supported by the National Defense Preresearch Fund of China under Grant No. 41101030401
文摘A parameter estimation approach of reconnaissance hybrid radar signal combined frequency-shift keying （FSK） and phase-shift keying （PSK） is presented. Firstly, the multi-phase difference is adopted to calculate the instantaneous frequency （IF） of FSK/PSK, then the frequency points of FSK are estimated from the histogram of IF. The code rate of PSK is extracted from the locations of phase discontinuity. Finally, the multi-phase difference of the square of the received signal is computed to estimate the code rate of FSK. The presented algorithm has higher accuracy of parameter estimation when the signal-to-noise ratio （SNR） is above 11 dB.
