Round Jet and Steady Flow Rig Test Stand
Round Jet and Steady Flow Rig Test Stand
| The Gas Phase Facility of the TMUAL was designed to provide model flows for the development of Molecular Tagging Velocimetry (MTV) in gas phase flows. It consists of a flow rig that can be used for the study of an axisymmetric jet flow as well as the intake flow fluid dynamics of an IC engine (for flow visualization and velocimetry results, visit the photo gallery of fluid motion). The geometry for the latter flow situation simply comprises a quartz cylinder with a stationary, axisymmetrically seated valve. There is no piston. The flow consists of a steady discharge of fluid into the engine geometry. The flow leaves the facility through the open end cylinder. This geometrical configuration has been used by engine researchers for the investigation of fundamental engine intake phenomena and is called "steady flow rig". Except for the missing piston, the geometrical configuration of the model engine is identical to that of a water analog model that we use for engine intake studies. |
| The picture above shows the gas phase facility
in the steady flow rig mode. The flow through the facility is from the
bottom to the top of the picture. One can see the open end quartz cylinder
and the brass valve at the base of the cylinder. Fluid is supplied to the
flow facility by the red tube. This red tube is hooked up to the outlet
of the "seeding" chamber (see also schemtic below). In the seeding chamber,
the flow marker for the MTV measurements is added to the nitrogen stream.
The flow marker, biacetyl, is liquid at room temperature and enrichment
of nitrogen with biacetyl is achieved by bubbling nitrogen through the
liquid biacetyl.
Fluid flow through the facility is generated by
a high pressure nitrogen reservoir in a blow down manner (see schematic
below). Discharge pressure and flow rate are controlled with a pressure
regulator. The flow can be impulsively started and stopped with a solenoid
valve. A flow capacitor is put in line to avoid strong splashing action
in the seeding chamber after the start-up of the flow. Just upstream of
the discharge nozzle (exit plane), a flow management module is inserted.
The purpose of this module is to straighten out the flow in the facility
and to reduce the level of turbulent intensities in the flow. The flow
management module consists of a perforated plate, a honeycomb, and a fine
meshed screen, in that order. For the jet experiments, an industrial loudspeaker
module is mounted upstream of the flow management module. The loudspeaker
is used for acoustical excitation and perturbation of the jet flow.
|
