Abstract
A new test rig has been designed, built and commissioned, and is now jointly pursued to facilitate experimental investigations into advanced combustion processes (i.e., dual fuel, multi-mode) under turbulent conditions at high, engine-like temperature and pressure levels. Based on a standard diesel engine block, it offers much improved optical access to the in-cylinder processes due to its separated and rotated arrangement of the compression volume and combustion chamber, respectively. A fully variable pneumatic valve train and the appropriate preconditioning of the intake air allows it to represent a wide range of engine-like in-cylinder conditions regarding pressures, temperatures and turbulence levels. The modular design of the test rig facilitates easy optimizations of the combustion chamber/cylinder head design regarding different experimental requirements. The name of the new test rig, Flex-OeCoS, denotes its Flexibility regarding Optical engine Combustion diagnostics and/or the development of corresponding Sensing devices and applications. Measurements regarding in-cylinder gas pressures, temperatures and the flow field under typical operating conditions are presented to complete the description and assessment of the new test rig.
Highlights
Over the last years, the emphasis in the development goal for new combustion engines in the field of heavy duty, power generation and marine applications has increasingly shifted from engine efficiency towards the reduction of harmful exhaust gas emissions including CO2
The new test rig is intended to fill the gap among: (1) constant volume cells; (2) rapid compression and expansion machines; 2
The new test rig is intended to fill the gap among: (1) constant volume cells; (2) rapid compression and expansion machines; and (3)
Summary
The emphasis in the development goal for new combustion engines in the field of heavy duty, power generation and marine applications has increasingly shifted from engine efficiency towards the reduction of harmful exhaust gas emissions including CO2. They can be divided into test rigs more suitable for engines at the involved research institutes. This of machine is mostly for fundamental used for fundamental studies ignition andof combustion processes studies concerning ignition andconcerning combustion processes various fuel types. of various fuel types
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