Abstract
Abstract The article presents the results of numerical calculations and experimental results of a flow through the orifice. Such a measuring device was built-into the ball valve that gave unique possibility of the orifice exchange without the pipeline disassemble. The advantages of using the prototypical solution has been described. This patented solution has been tested extensively for the durability and tightness. The article contains comparison between flow character in the case of single-hole orifice and a multi-nozzle one. The prototypical measuring device has been produced and assembled in compressed air system in the Power Plant Opole, that gave experimental verification of theoretical approach.
Highlights
The article presents the results of numerical calculations and experimental results of a flow through the orifice
Such a measuring device was built-into the ball valve that gave unique possibility of the orifice exchange without the pipeline disassemble
When comparing the pressure difference for a singlehole flange, determined by means of the numerical method, which is 11,8 kPa, with analytically obtained according to the Standard [1] – 11,465 kPa, one can notice a large convergence of results allowing to accept numerical calculations as correct
Summary
F gravitation (from N-S equation) p air pressure, bar (or kPa) p1 air pressure at the inlet, bar Q mass flow at the inlet, Nm3/h qvn volumetric flow of air, Nm3/h qm mass flow of air, kg/h qv volumetric flow of air, m3/h v velocity (from N-S equation) t time (from N-S equation) Tp air temperature, ∘C ∆p air pressure difference, kPa ∆p1 pressure difference on the edge of orifice hole, kPa. One of possibility of accuracy improvement is application of solution patented by ZPDA Ostrow Wielkopolski [2] Another problems that exist in described construction are more additional places of leakage. The patented construction enables fast trouble-free and safe replacement of the orifice Such solution allowed to carry-out measurement temporarily, that does not generate resistance in permanent way, since the orifice can be removed. Manufacturers of fluid flow measuring devices in recent years have begun searching for solutions characterized by lower hydraulic losses and allowing for increased accuracy of measurement For this purpose, consideration has been given to multi-nozzle orifices currently used by many research centers. This type of research is extremely important in an era of times where savings are sought everywhere. In large plants, such as, power plants, consumption reduction by several tenths of a percent per year may turn out to be a significant saving
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