EFFECTS OF BOUNDARY CONDITIONS ON A BOSCH-TYPE INJECTION RATE METER

IF 1.3 4区工程技术 Q3 TRANSPORTATION SCIENCE & TECHNOLOGY

Transport Pub Date : 2021-03-01 DOI:10.3846/TRANSPORT.2021.14351

Sándor Vass, M. Zöldy

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引用次数: 1

Abstract

Spread and evolution of Common Rail (CR) injection systems enable to influence injection events more efficiently than ever, while injection mass flow rate during an injection event crucially affects the combustion process. A measurement device based on the work of Bosch was set up, and measurements were made with different boundary conditions to explore the capabilities of the measurement system and to validate a detailed model of a CR injector. The main finding of this research work is, that orifice size had no noticeable effect on the measured injection rate traces, while it was stated in the original work that a small orifice is needed to terminate the measuring tube to maintain stable measurement conditions. Moreover, the backpressure level in the measuring system has a significant effect on the measured injection traces. If pressure in the measuring tube is low, gradient at the injection rate rise is lower, while if the pressure is comparable with that of a combustion chamber maximal compression pressure, measurement of higher doses is unaccomplishable due to the long pressure decrease time in the measuring tube after the end of the injection. Based on the results of the investigation, it can be stated that the Bosch-type injection rate measurement method does not give back the exact injection rate shape, a supplementing method would be necessary to calculate real nozzle flow rate.

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边界条件对波希式注射速率计的影响

共轨(CR)喷射系统的普及和发展使其能够比以往更有效地影响喷射事件，而喷射事件中的喷射质量流量对燃烧过程至关重要。搭建了基于Bosch工作成果的测量装置，并在不同的边界条件下进行了测量，以探索测量系统的能力，并验证了CR喷油器的详细模型。本研究工作的主要发现是，孔口尺寸对测量的注射速率轨迹没有明显的影响，而在原工作中指出，需要一个小的孔口来终止测量管以保持稳定的测量条件。此外，测量系统中的背压水平对测量的喷射轨迹有显著影响。如果测量管内压力较低，则喷射速度上升时的梯度较低，而如果压力与燃烧室最大压缩压力相当，则由于喷射结束后测量管内压力下降时间较长，因此无法测量更高剂量。从研究结果可以看出，波希式喷油速率测量方法并不能给出准确的喷油速率形状，需要一种补充方法来计算真实的喷嘴流量。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Transport Engineering-Mechanical Engineering

CiteScore

3.40

自引率

5.90%

发文量

审稿时长

4 months

期刊介绍： At present, transport is one of the key branches playing a crucial role in the development of economy. Reliable and properly organized transport services are required for a professional performance of industry, construction and agriculture. The public mood and efficiency of work also largely depend on the valuable functions of a carefully chosen transport system. A steady increase in transportation is accompanied by growing demands for a higher quality of transport services and optimum efficiency of transport performance. Currently, joint efforts taken by the transport experts and governing institutions of the country are required to develop and enhance the performance of the national transport system conducting theoretical and empirical research. TRANSPORT is an international peer-reviewed journal covering main aspects of transport and providing a source of information for the engineer and the applied scientist. The journal TRANSPORT publishes articles in the fields of: transport policy; fundamentals of the transport system; technology for carrying passengers and freight using road, railway, inland waterways, sea and air transport; technology for multimodal transportation and logistics; loading technology; roads, railways; airports, ports, transport terminals; traffic safety and environment protection; design, manufacture and exploitation of motor vehicles; pipeline transport; transport energetics; fuels, lubricants and maintenance materials; teamwork of customs and transport; transport information technologies; transport economics and management; transport standards; transport educology and history, etc.