新型流量计动态节流元件文丘里管的研究与优化.pdf

Jun.2015
Hydromechatronics Engineering
Vo]. 43 No. 12
dromechatronics Engineering
http://jdy.qkscqut.educn
E-mailjdygcyw@126.com
Research and optimization on the venturi tube
dynamic throttling element of new flowmeter
Jian-mei DING*.Hai WANG
(College of Mechanical and Electrical Engineering, ortheast Forestry University, Harbin 150040, China)
Absract: According to the working process of dynamic throttling element flowmeter, the Reynolds number keeps
constant when the flow is steady. The way to change the pressure drop is to change the local pressure loss. Based
on the Eluent software, it has been analyzed that how the structure parameters of venturi tube influence the pre
sure drop. With the completion of flowmeter prototype
the dynamic throttling element was tested by using a kind
of binary flow calibration platform. According to the test results, it could conclude that the optimization could per
fectly meet the real flow condition
Key words: Flowmneter, Venturi tube. P
ressure
doi:10.3969/j.isn.1001-3881.2015.12.002
Document code. A
CLC number: TH814
1 Introduction
2 Technology analysis
The small diameter of pipeline and impurities in our
The schematic shown in Fig. 1 is the working status
heating supply system makes the normal flowmeters of dynamic throttling element
hard to work, such as vortex flowmeter. turbine
When the fluid flows through the dynamic throttling
flowmeter, electromagnetic flowmeter and the differen-element, a pressure drop will occur. At the same
lal pressure flowmeter with holes. To meet the
e de-
fluid will impose a driving force to the d
mand of heat metering, we design a kind of new namic throttling element. So we can calculate the flow
flowmeter based on dynamic throttling element. The rate by detecting the driving force. Because the pres
core component of the flowmeter is a venturi tube with
sure drop is produced by the dynamic throttling ele
two metal diaphragms. A very important parameter
ment, the key point is to analyze how the dynamic
which affects the performance of the new flowmeter is throttling element affects the pressure drop
the pressure drop between inlet pl
ressure and outlet
pressure, so we focus on the throttling performance of
venturi tube. With the help of Fluent software, we an-
lyze the parameters which affect the pressure drop
and obtain a kind of venturi tube which could be used
in the new flowmeter
?
Received 20 December 2014; revised 6 February 2015
Flg. 1 Working status of dynamlcthrottling element
Accepted II March 2015
Corresponding author: Jian-mei DING. Professor
s we can see from Fig
the
e ventun tube is
E-mail:djm801@126.com
made up with a contraction tube and an expansion
tube. According to the principle of fluid dynamics