It expounds the form principle to flow state in the installation of mixer, and puts forward an power coefficient of the installation of mixer to Re>10 4,briefly explains the superiority and applying scope to installation of mixer.
This article advences. the formulas determining the transmission power Po of single common V belt by using power coefficient method and gives some specific values of the power coefficient K_1, K_2, K_3 suiting practical situation according to the present data table Po in China.
Experiment verifies that the power coefficient of NACAZ2 blade is maximum, and the power coefficient of NACAZ3 blade is close to that of NACAZ2 blade. The power coefficient of NACAZ2 blade is 37% bigger than that of NACAZ1 blade at blade top speed ratio 2. The calculation and experimental results indicate that the synthetic capabilities of NACAZ2 blade are better, which behaves as bigger torque coefficient, quicker start-up and greater power output at the same wind speed.
Two problems from actual usage are discussed in this paper: the first is the calculation method of short circuit torque of electric machine and the second is how to consider the power coefficient at sudden load affecting.
By experimental validation of generator output characteristic, the start-up wind speed of the rotor is 3.5m/s. When the natural speed is 7.4m/s, the maximum rotor power coefficient is 0.40 and the output power is 313.9W;
The result shows, for pitch controlled wind turbine rotor, higher power coefficient is obtained at low wind speed, output of power keep constant and the load of blade and drive train is significantly reduced at high wind speed.
Compared with fix-pitch wind turbine, the variable-pitch wind turbine has the virtue : stable output power over rated power, high wind power coefficient, holding rated power at high wind speed, good starting and shut-off etc.
The thermoelectric power coefficient has been determined in this investigation to be a rapid and accurate measurement that can be used for microstructural assessment and correlated to achieve the maximum material performance of structural alloys.
Two-dimensional FDTD calculations allow us to design a waveguide that presents a transmitted band between 1240 and 1610 nm with a power coefficient of 90%.
Absorption power coefficient ranged from a minimum value of 0.0004 to maximum value of 0.1585 at a seat temperature of 1150 K over the plume depth.
The reflection power coefficient for different parameters of the beam and the screen is given.
The power coefficient(Cpd0) of DAWT reaches 1.5 at C0 ? -0.5,No ? 1.0 andCr ? 0.5, but the augmentation ratio(Rb) reaches 6.0 at C0 ? -0.5,Cr ? 0.9, and reaches 7.0 atNo ? 1.0 and Ct ? 1.0, which gives a good application for DAWT systems.