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Articles by ZHAO Li-Hua
Total Records ( 2 ) for ZHAO Li-Hua
  Zhao Li-Hua , Liu Ming and Lv Tie
  The utilization efficiency of wind energy is directly affected by airfoil aerodynamic performance. So, it is important to study it. In this study, CFD software is used to analyze the aerodynamic performance of lift type vertical axis wind turbines at low Reynolds number. Three types of airfoil which are NACA2414, NACA4414 and NACA6414, are analyzed by numerical simulation, mainly study the influence of relative camber airfoil on wind turbine aerodynamic performance under different angle of attack and the change rule of airfoil aerodynamic parameters and the state of streaming for these three types of airfoil under different angle of attack is obtained. The result shows that the lift coefficient of airfoil under different Angle of attack and lift-drag ratio will increase, with relative camber airfoil increasing,the airfoil thickness keeping stable,but the airfoil drag coefficient has no obvious change, it will help the optimal design of airfoils for vertical axis wind turbines.
  WEI Li , LIN Zhi-Hua , MA Xiao-Mei , ZHAO Li-Hua and MA Xiao-Hao
  We recorded and described the calls and acoustic characteristics of the male tiger frog, Hoplobatrachus rugulosus, in an artificial pond during mating season. Spectral and temporal call parameters, along with call intensity were analyzed. Three harmonics were distinguishable from the spectrogram. Four patterns of dominant frequency were found in calls produced late at night, i.e, 3 patterns in the first harmonic (located in 500 Hz section, 700 Hz section, and 800 Hz section respectively) and 1 in the second harmonic (located in 1 800 Hz section). Call duration, call duty cycle, call intensity, and pulse rate were highly variable among different patterns of dominant frequency. These call properties could provide valuable evidence for further ecological study of this species.
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