The following figures show the plot of pressure coefficient
for both upper and lower surfaces for each airfoil against horizontal distance measured downstream from the main element's leading edge.
Force coefficients, [C.sub.L] and [C.sub.D], and the pressure coefficient
, [C.sub.p], were repeatable to [+ or -]0.00010, [+ or -]0.00024 and [+ or -]0.003 respectively.
For each wind pressure coefficient
test, the fan was allowed to run for several minutes in order to obtain stable conditions.
where [k.sub.0] is the lateral pressure coefficient
, H is the cover depth of the coal seam (m) considered in the paper, and [gamma]' is the average weight of the overlying coal seam layer (kN/[m.sup.3]).
simulated by CFD for wind-driven ventilation analysis.
The pressure coefficient
(CP) for each tapping point is calculated by putting the pressure data in the following equation as follows:
The lateral pressure coefficient
on lateral wall from h=1m to h=7m can be obtained.
The effects of varying the pitchwise positions of the rotor blade on the expansion are assessed in terms of the total-to-total and total-to-static isentropic efficiencies and the pressure coefficient
. The trigger positions (4[degrees], 2[degrees], 0[degrees], -2[degrees], and -4[degrees]) are indicated by Figure 13.
However, a consensus with regard to the wall pressure coefficient
[kappa] is not generally accepted.
In this process, parameters that need to be determined are classified into four types according to their properties: (1) physical and mechanical parameters of the stress field, namely, the rock mass gravity [gamma], elasticity modulus E, Poisson ratio [mu], cohesion C, and internal friction angle [phi]; (2) parameters of the seepage field, including the permeability coefficient of different strata or the facture aperture, and the normal stiffness of the facture rock masses; (3) parameters related to the in situ stress field, for example, the lateral pressure coefficient
of initial ground stress; and (4) the coefficients of the coupled empirical relationship.
Next, three schemes when the lateral pressure coefficient
is equal to 1.5 have been numerically simulated.
Because of the existence of the time dependent volumes, the pressure coefficient
matrix A is almost nonsymmetric.