Unsteady dielectric barrier discharge（DBD） plasma aerodynamic actuation technology is employed to suppress airfoil stall separation and the technical parameters are explored with wind tunnel experiments on an NACA00...Unsteady dielectric barrier discharge（DBD） plasma aerodynamic actuation technology is employed to suppress airfoil stall separation and the technical parameters are explored with wind tunnel experiments on an NACA0015 airfoil by measuring the surface pressure distribution of the airfoil.The performance of the DBD aerodynamic actuation for airfoil stall separation suppression is evaluated under DBD voltages from 2000 V to 4000 V and the duty cycles varied in the range of 0.1 to 1.0.It is found that higher lift coefficients and lower threshold voltages are achieved under the unsteady DBD aerodynamic actuation with the duty cycles less than 0.5as compared to that of the steady plasma actuation at the same free-stream speeds and attack angles,indicating a better flow control performance.By comparing the lift coefficients and the threshold voltages,an optimum duty cycle is determined as 0.25 by which the maximum lift coefficient and the minimum threshold voltage are obtained at the same free-stream speed and attack angle.The non-uniform DBD discharge with stronger discharge in the positive half cycle due to electrons deposition on the dielectric slabs and the suppression of opposite momentum transfer due to the intermittent discharge with cutoff of the negative half cycle are responsible for the observed optimum duty cycle.展开更多
The distribution of heat duties among individual separation subsystems and other as-pects of heat intergration in such systems are reviewed. Heat integration for different separation processes is investigated, using ...The distribution of heat duties among individual separation subsystems and other as-pects of heat intergration in such systems are reviewed. Heat integration for different separation processes is investigated, using the pinch point method, Such a study will provide theoretical guide lines for the proper choice of a desirable separation process.展开更多
Eighty-six senile persons,aged 60 years old or over,were treated by medicinalcake-separated moxibustion and the influence of moxibustion upon red blood cell immunity func-tion and free radical was observed.We have ado...Eighty-six senile persons,aged 60 years old or over,were treated by medicinalcake-separated moxibustion and the influence of moxibustion upon red blood cell immunity func-tion and free radical was observed.We have adopted the principle of tonifying the kidney andstrengthening the spleen,promoting blood flow and removing blood stasis.The tonic points suchas Dazhui（GV 14）,Shenshu（BL 23）,Guanyuan（CV 4）,Shenque（CV 8）and Zhsanli（ST36）were chosen.Besides,it was supplemented with the principle of nourishing blood,tonifyingspleen and replenishing essence,using medicinal cake moxibustion.The moxibustion was givenonce every other day,three moxa-cone on each point,and twenty-four times as a therapeuticcourse.The total moxibustion amount is 264 moxa-cone.Before and after the treatment,wemeasured the red blood cell immunity function（RBC-C<sub>3</sub>b,RBC-IC,RFER,RFIR）,the SOD ac-tivity of RBC,and the contents of serum LPo. Results show that in senile person,the RBC-C<sub>3</sub>b rosette formation falls while the展开更多
基金supported by National Natural Science Foundation of China(No.21276036)Liaoning Provincial Natural Science Foundation of China(No.2015020123)the Fundamental Research Funds for the Central Universities of China(No.3132015154)
文摘Unsteady dielectric barrier discharge（DBD） plasma aerodynamic actuation technology is employed to suppress airfoil stall separation and the technical parameters are explored with wind tunnel experiments on an NACA0015 airfoil by measuring the surface pressure distribution of the airfoil.The performance of the DBD aerodynamic actuation for airfoil stall separation suppression is evaluated under DBD voltages from 2000 V to 4000 V and the duty cycles varied in the range of 0.1 to 1.0.It is found that higher lift coefficients and lower threshold voltages are achieved under the unsteady DBD aerodynamic actuation with the duty cycles less than 0.5as compared to that of the steady plasma actuation at the same free-stream speeds and attack angles,indicating a better flow control performance.By comparing the lift coefficients and the threshold voltages,an optimum duty cycle is determined as 0.25 by which the maximum lift coefficient and the minimum threshold voltage are obtained at the same free-stream speed and attack angle.The non-uniform DBD discharge with stronger discharge in the positive half cycle due to electrons deposition on the dielectric slabs and the suppression of opposite momentum transfer due to the intermittent discharge with cutoff of the negative half cycle are responsible for the observed optimum duty cycle.
基金Supported by the Research Promotion Foundation for Returned Scholar of the China Education Commission.
文摘The distribution of heat duties among individual separation subsystems and other as-pects of heat intergration in such systems are reviewed. Heat integration for different separation processes is investigated, using the pinch point method, Such a study will provide theoretical guide lines for the proper choice of a desirable separation process.
基金The project was supported by the National Natural Science Foundation of China
文摘Eighty-six senile persons,aged 60 years old or over,were treated by medicinalcake-separated moxibustion and the influence of moxibustion upon red blood cell immunity func-tion and free radical was observed.We have adopted the principle of tonifying the kidney andstrengthening the spleen,promoting blood flow and removing blood stasis.The tonic points suchas Dazhui（GV 14）,Shenshu（BL 23）,Guanyuan（CV 4）,Shenque（CV 8）and Zhsanli（ST36）were chosen.Besides,it was supplemented with the principle of nourishing blood,tonifyingspleen and replenishing essence,using medicinal cake moxibustion.The moxibustion was givenonce every other day,three moxa-cone on each point,and twenty-four times as a therapeuticcourse.The total moxibustion amount is 264 moxa-cone.Before and after the treatment,wemeasured the red blood cell immunity function（RBC-C<sub>3</sub>b,RBC-IC,RFER,RFIR）,the SOD ac-tivity of RBC,and the contents of serum LPo. Results show that in senile person,the RBC-C<sub>3</sub>b rosette formation falls while the
