A prismatic form cutter for machining a needle valve gate

1983 ◽  
Vol 19 (4) ◽  
pp. 162-165
Author(s):  
B. Sh. Gasanov
Keyword(s):  
Needle Valve ◽  
Valve Gate

Study on Wear-Preventing of Needle Valve in Fuel Injection System Mounted on DME Engine

2011 ◽  
Vol 228-229 ◽  
pp. 1057-1062
Author(s):  
Xin Rong Wen ◽  
Guang De Zhang ◽  
Wei Hua Wang ◽  
Xie Lu ◽  
Sun Jing
Keyword(s):  
Dynamic Stability ◽  
Structural Design ◽  
Fuel Injection ◽  
Dynamic Instability ◽  
Calculation Model ◽  
The Other ◽  
Injection System ◽  
Needle Valve ◽  
Fuel Injection System ◽  
Theoretical Support

The purpose of this paper is to provide theoretical support for the structural design to prevent the wear of needle. The actual wear of the orientation part of the needle in scrapped needles was researched. The presented results showed that the main reason to the wear of the orientation part of needle was the dynamic instability and the abrasives enter into the surface of orientation part which increases the wear, and that the calculation model of dynamic stability was proposed to prevent the wear of needle. This model was a pressure rod, one end of which was fixed, the other was free, and the two ends were pressed on axial force which changes with time. Besides, the classic formula of dynamic stability of pressure rod was changed rationally, so as to correspond with the calculation model. It will play a part in preventing the wear of needle.

Numerical Simulation on the Sound Field of Gas Valve Due to Inner Leakage

2009 ◽  
Author(s):  
Bing Wang ◽  
Yadong Wang ◽  
Wenjun Liang ◽  
Shuiping Sheng ◽  
Jianping Guo ◽  
...  
Keyword(s):  
Complex Geometry ◽  
Sound Field ◽  
Needle Valve ◽  
Gas Leakage ◽  
Testing Method ◽  
Acoustic Equation ◽  
Valve Leakage ◽  
Acoustic Testing ◽  
Difference Time ◽  
Reynolds Average

Recently, acoustic testing method has been widely used for valve leakage inspection. Traditional method has difficulty carrying out research on the acoustic testing of valve leakage due to the complex geometry of the valve and the effect of flow on sound field. Thus, a numerical method was put forward based on Reynolds average N-S equation and k – ε equation in order to investigate the flow of the inner leakage of ball valve, needle valve and gate valve. Furthermore, difference time domain method was adopted to simulate the noise field of the flow based on Lighthill acoustic equation. And the characteristics of acoustic distribution were obtained. The results showed that turbulent flow was the main cause of jet noise inner the valve due to gas leakage. And the acoustic distribution had directivity. There were about 10 ∼ 25dB difference between the upstream and downstream of the leaking valve. The position with the highest sound pressure was also found out.

Simulation of cavitation in outward-opening piezo-type pintle injector nozzles

2008 ◽  
Vol 222 (10) ◽  
pp. 1895-1910 ◽  
Author(s):  
E Giannadakis ◽  
D Papoulias ◽  
A Theodorakakos ◽  
M Gavaises
Keyword(s):  
Bubble Growth ◽  
Large Scale ◽  
Direct Injection ◽  
Bubble Formation ◽  
Needle Valve ◽  
Transient Effects ◽  
Cavitation Model ◽  
Gasoline Engines ◽  
Opening And Closing ◽  
Vapour Film

The onset and development of cavitation in the annular needle seat passage of piezo-driven outward-opening pintle injector nozzles used with spray-guided direct-injection gasoline engines are studied using a Eulerian-Lagrangian computational fluid dynamics cavitation model. Cavitation is formed because of the fluid acceleration taking place at the needle sealing area and it has been found to be affected by its geometric details. Various submodels for nucleation and bubble formation, further bubble growth and collapse, as well as bubble break-up and transport are incorporated into the model. Qualitative model validation is performed against experimental data reported elsewhere in large-scale nozzle replicas, showing similar cavitation patterns to be formed. These consist of vapour pockets rather than a continuous vapour film and develop transiently in a rather chaotic manner around the circumferential needle sealing area, even under stationary geometry and fixed-flowrate conditions. Further transient effects associated with the fast opening and closing of the piezo-controlled needle valve are also presented.

Simulation and Measurement of Fuel Injection Quantity Based on TB4P

2014 ◽  
Vol 26 (1) ◽  
pp. 34-39 ◽  
Author(s):  
Dongmin Li ◽  
◽  
Jianzhong Zhang ◽  
Jianjun Yuan ◽  
FancanGuo ◽  
...  
Keyword(s):  
Relative Error ◽  
Fuel Injection ◽  
Injection Pressure ◽  
Valve Lift ◽  
Needle Valve ◽  
Fuel Injector ◽  
Injection Pump ◽  
Injection Quantity ◽  
Fuel Injection Pump ◽  
Fuel Injection Pressure

In order to improve the measurement accuracy of fuel injection quantity based on Test Bench for fuel injection Pump (abbr. TB4P), on the basis of the function between needle valve lift and fuel injection quantity, two-level pressure adjustment module, which combines proportional flow rate valve with pressure sensor and takes advantage of spring of fuel injector, is used to control the outlet pressure of fuel injection pump, which results in the fuel injection pressure stably. Fuel injection pump and fuel injector are modeled by use of HCD of AMESim, and the system model of fuel injection quantity measurement is built. Simulation curve of fuel injection quantity is got by AMESim, which is compared with the curve of standard fuel injection quantity according to relative error. The results show that the relative error from the data of simulation system is smaller, so the methods of measurement and simulation in this paper are effective.

1314 Influence of Needle Valve Movement to Internal Flow of a Marine Diesel Nozzle

2016 ◽  
Vol 2016.54 (0) ◽  
pp. _1314-1_-_1314-2_
Author(s):  
Keiichiro YABUTA ◽  
Sumito YOKOBE ◽  
Katsuyuki OHSAWA ◽  
Tetsuya ODA
Keyword(s):  
Internal Flow ◽  
Needle Valve ◽  
Valve Movement ◽  
Marine Diesel ◽  
Diesel Nozzle

Numerical Analysis of Cavitation Phenomenon in a Vaned Ring-Type Needle Valve

2015 ◽  
Vol 141 (4) ◽  
pp. 04014053 ◽  
Author(s):  
Hassan Gholami ◽  
Hamidreza Yaghoubi ◽  
Mansour Alizadeh
Keyword(s):  
Numerical Analysis ◽  
Needle Valve ◽  
Ring Type ◽  
Cavitation Phenomenon
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