噴流特性によるノズル性能の判定について

抄録

For the purpose of determining the performance of nozzle of the hydraulic mining device, the authors investigated the flow characteristics of water jet which had ever studied theoretically and r, experimentally under changing the discharge pressure between 3kg/cm² and 10kg/cm² at nozzle mouth with diameter 6 mm.
The flow characteristics of water jet were given as follows;
a) Divergence coefficient of jet;_??_
b) Profile of jet;_??_
c) Dynamic pressure distribution along center line of jet;_??_
d) Transition length of jet;_??_
e) Dynamic pressure distribution along radial axis of jet;
_??_
Where l=distance of the jet from the nozzle, l_T=transition length of jet, D₀=diameter of the nozzle, R₀=radius of the nozzle, R=arbitrary radius of the l jet at the distance l, D_l=diameter of the jet at the point of distance l, _??_(called Jet number, γ, γa=specfic weight of the water and air, H₀=discharge pressure head and Ci =surface tension), P₀=discharge pressure, P_m=dynamic pressure along center line of jet and P_m=dynamic pressure at the point of arbitrary radius R.