One, introductive

Well-known, dimensions produces beneficial result, nearly 2, come 30 years, of the project large turn the inevitable tide that already made modern industry progress. The caliber in the project is more than300 millimeterconduit is very general already, its discharge detects (particularly right gas) increasingly pressing already remain to solve. The meter that can measure aeriform flow is not little, reach production angle from the principle for, dimension enlarge should not have a problem, but the bulk of appearance and weight press blurt out diameter geometrical progression to grow, and still can bring other issue. For example orifice plate, the throttle unit with this kind of hep people, become when requirements is larger not only cumbersome, still have too big control damage, moving fee is exorbitant, duan Da 30D~40D is in charge of continuously before plus ISO5167 new standard asks, the spot cannot be satisfied. Very difficult consideration uses this kind of instrument again.

Quantitative change arrives qualitative change, face these dilemma, in recent years, general it is to use sampling principle, thrust installation way, measure only in taking conduit a bit or dotty velocity of flow comes the insertion of computative discharge type flowmeter, the common characteristic of this kind of appearance is: Simple, installation maintains the structure convenient, price cheap, repeatability is good, it is to be versed in in controlling a system, detect the appearance with higher price of sex of discharge of big conduit gas, general accuracy is not tall, unfavorable use at needing accurate and metric trade close an account. Because of its the principle all is sampling property, want to understand the velocity of flow inside conduit to distributing above all so, the position of test point of correct make choice of reachs such ability amount.

2, industrial tube flows

1, the velocity of flow inside Protean canal distributings

The project of all trades and professions, from its the craft of itself asks to set out, must install mixed tubal fittings in conduit (like valve, bend, manifold, change diameter canal, filter) . Because their form reachs combination slue, the velocity of flow inside the valve that causes distributings Protean also, estimate hard (graph 1b) . R
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