Experimental Determination of Reactions of Wind-Resistant Support of Circular Stacks in Various Configurations
Higher capacities of power plants together with increased awareness on environmental considerations have led to taller height of stacks. It is seen that strong wind can result in falling of stacks. So, aerodynamic consideration of stacks is very important in order to save the falling of stacks. One stack is not enough in industries and power sectors and two or three stacks are required for proper operation of the unit. It is very important to arrange the stacks in proper way to resist their downfall. The present experimental study concentrates on the mutual effect of three nearby stacks on each other at three different arrangements, viz. linear, side-by-side and triangular. The experiments find out the directions of resultant forces acting on the stacks in different configurations so that proper arrangement of supports can be made with respect to the wind directionality obtained from local meteorological data. One can also easily ascertain which stack is more vulnerable to wind in comparison to the others for a particular configuration. Thus, this study is important in studying the effect of wind force on three stacks in different arrangements and is very helpful in placing the supports in proper places in order to avoid failing of stack-like structures due to wind. Keywords—Stacks, relative positioning, drag and lift forces, resultant forces and supports.
The design of spires for wind simulation
In this note simple formulae are given for the design of spires for use in simulating the planetary boundary layer. The detl:iils of the derivation are omitted in the interests of clarity and conciseness but may be found in full in Ref. 1, including some refinements to account for the presence of a ramp, or blockage caused by a model, and to include the effect of corner fillets. The use of spire arrays combined with floor roughness (Fig. 1) began in the late 1960's (2-,3 J when it was discovered that they gave velocity profiles of
The effects of wake splitter plates on bluff-body flow in the range 104 < R < 5 × 104. Part 2
The work reported in part 1 has been extended to cover flows past circular cylinders with wake splitter plates having 2 [les ] L/D [les ] 7 and to include flows past normal flat plates with splitter plates having L/D [les ] 3·7. Pressure distributions and wake Strouhal numbers were measured and visualization studies carried out. The results obtained indicate that no further changes would be produced by lengthening the splitter plates beyond the limits tested. The combined results of parts 1 and 2 provide coherent descriptions of the effects of wake splitter plates for all values of L/D of significance for the two profiles, which are representative of two distinct classes of bluff bodies, viz., those with cross-sections of curvilinear shape for which the flow separation points are not determined uniquely by the geometry and those for which the separation points are fixed.