Measurement of Plunger Couples Surface Gap Leakage for DME Engine Fuel Delivery System

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Measurement of Plunger Couples Surface Gap Leakage for DME Engine Fuel Delivery System

更新时间：2025-07-09

- Measurement of Plunger Couples Surface Gap Leakage for DME Engine Fuel Delivery System
- Vol. 46, Issue 11, Pages: 12-16(2012)
- 作者机构：
  
  西安交通大学能源与动力工程学院,西安,710049
- 作者简介：
- 基金信息：
- DOI：
  CLC： TK42
- Online First：10 November 2012，
  
  Published：2012
- 稿件说明：
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Measurement of Plunger Couples Surface Gap Leakage for DME Engine Fuel Delivery System[J]. 2012, 46(11): 12-16.
DOI：

Measurement of Plunger Couples Surface Gap Leakage for DME Engine Fuel Delivery System[J]. 2012, 46(11): 12-16. DOI：

摘要

为了精确测量二甲醚发动机燃料供给系统中偶件间隙的燃料泄漏量

设计了一套适用于测量微小流量的测量装置.该装置在活塞压力计基础上通过排除油缸自身泄漏

精确地建立了恒定压力

以实现恒温、恒压下间隙燃料泄漏量的测量

包括三组偶件的泄漏量和柱塞偶件不同位置的泄漏量.通过理论计算验证了测量的精确性

结果表明:偶件泄漏量从大到小依次为柱塞-针阀-出油阀

柱塞偶件不同部位泄漏量从大到小依次为进回油孔-泄油槽-裙部; 二甲醚泄漏量几乎为柴油的1.8倍

且随着密封长度的增加该倍数减小.通过实测柴油泄漏量反算获得了间隙高度

再由间隙高度计算得到的二甲醚泄漏量

并与测量结果进行了对比

从而验证了测量装置的精确性.

Abstract

To measure the leakage for couple surface gap of dimethyl ether(DME)engine fuel delivery systems accurately

a test device was developed on the basis of a piston pressure gauge without leakage. The device can establish isopiestic pressure and measure the leakage under the condition of constant temperature and isopiestic pressure. The leakages for couples including five positions of plunger and barrel assembly were measured

and the tested results were compared with those of diesel fuel. Moreover

the measurement accuracy of the device was verified by the theoretical calculation. The results show that the leakages for couples and the plunger piston are in sequence of plunger piston > needle valve > delivery valve and inlet and outlet holes > drain pan > skirt; the leakage of DME is 1.8 times that of diesel fuel and the multiple decreases with an increase in sealing length. In addition

the measured data were compared with the results calculated with the couple surface gap from the leakage of diesel fuel and the calculated results are consistent with the measured data.

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references

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