MAHLE Powertrain's single cylinder research engine for optical combustion analysis

1. Single Cylinder Optical Access Research Engine
The technology of spark ignition engines is growing at an Contact Information
accelerated rate and this demands increasing levels of MAHLE Powertrain, LLC
understanding of the in-cylinder processes. In particular, with the Novi, MI 48375
advent of new combustion and fuel injection concepts, a greater
powertrain@us.mahle.com
comprehension of air motion, fuel spray behavior, mixture
(248) 473-6600
formation and turbulence is required.
MAHLE Powertrain's optical access research engine was
developed with these objectives in mind. Having the ability to
capture and visually record the combustion process allows for
detailed comparative analysis to be carried out and provides the
opportunity for qualitative and quantitative measurements to be
taken. The initial work focus has been to support the validation of
CFD in-cylinder modeling using laser-based optical techniques
such as PIV (Particle Image Velocimetry) and LDA (Laser Doppler
Anemometry). This was followed by high-speed imaging of fuel
spray development and flame growth. Further projects are now
underway to gather the necessary data for thermodynamic analysis
and to investigate the influence of alternative fuels and variable
valve actuation systems on engine efficiency and exhaust
emissions.
MAHLE Product Information 06/2009 1
©MAHLE Powertrain LLC, 2009

2. Single Cylinder Optical Access Research Engine
MAHLE Powertrain currently has two single cylinder Technical Data
research engines running at University College, London.
Displacement (VH) 0.48 l
They are located in a dedicated facility and operated by a
team of technical specialists and research personnel who Bore Diameter 82.5 mm (up to 100 mm)
are at the forefront of engine combustion research and Stroke 88.9 mm
analysis.
Base Compression 9.8 : 1
Ratio
Base Engine Speed 2,200 rpm (max)
Cylinder Liner Liner Height: 108 mm
Liner Thickness: 15 mm
Piston Window Sapphire
Optical Mirror Multi-Layer Aluminum
Optical Capability 70 - 80 %
Engine in test cell at UCL
Key Features
Modular design for alternative cylinder head options
Low cost, unbalanced derivative for low speed work
Balanced derivative for higher speeds
Port fuel or direct injection capability
Adaptable for different bore sizes / combustion chamber
designs
Bottom end taken from robust, heavy-duty donor engine Optical access liner and piston
Head can be mounted direct to barrel for non-optical
work
Compatible with alternative fuels (including hydrogen)
MAHLE Product Information 06/2009 2
©MAHLE Powertrain LLC, 2009