10F01 - Powder Seeding Generator Brochure

Powder Seeding Generator For LDA and PIV, 10 bar back pressure Introduction This seeding generator produces powder particles for PIV and LDA measurements. Able to operate in pressurised facilities and equipped with remote control it is recommended for difficult applications including combustion studies. Description The 10F01 seeder employs sonic jets which create high shear flow fields which break up the powder while it is being dispensed in the outlet chamber. The design of this seeder is such that clogging experienced by other powder seeders is inherently avoided. The proprietary powder dispensing method also ensures uniform seeding density during operation. Applications • Powder Seeding for Particle Image Velocimetry • Powder Seeding for Laser Doppler Anemometry • Flow visualisation • High temperature Combustion studies • High pressure flow applications (up to 10 bar) • Seeding in Hostile Environments Features • Up to 10 bar working back-pressure • Controllable seeding density • Remote Control Panel • Suitable for a variety of powders and particle sizes • Quick re-fill operation without the need to stop experiment Powder Seeding Generator Product Information Specifications ? Up to 10 bar working back-pressure ? Controllable seeding density ? Dilution air available ? Stainless steel pressure vessel construction ? Remote Panel Controls : Electrically operated rate of powder dispersal and thus seed density. Pressure regulator to adjust air supply to seeder. Two pressure gauges to indicate air supply pressure and seeder back pressure. Compatible with solenoid valves for PLC or computer control. ? Push-fit pipe connectors and colour coded air tubes for easy installation and adjustment of remote cable length. ? Suitable for a variety of powders and particle sizes. Aluminium oxide or titanium dioxide powders are recommended. This seeder was specifically developed for LDA and PIV applications where small particle grain powders need to be used. For LDA applications it is recommended to use aluminium oxide powder of 0.3µm size. ? Maximum duration for continuous powder delivery is 30 minutes. A second powder container drum is provided for quick change-over. Remote control panel enables the powder feed to be switched off when not needed thus extending the period between re-fills and minimising the quantity of powder used. ? Quick re-fill operation without the need to stop experiment. Performance The biggest problem with other powder seeders is the break up of the powder to the smallest grain size. With grain sizes below 1um particles tend to agglomerate and unless they are broken up by the seeder their ability to follow the flow is reduced. The 10F01 seeder employs sonic jets which create high shear flow fields which break up the powder while it is being dispensed in the outlet chamber. The design of this seeder is such that clogging experienced by other powder seeders is inherently avoided. The proprietary powder dispensing method also ensures uniform seeding density during operation. Comparison with liquid seeder: The seeder was tested against an oil mist generator in a supersonic wind tunnel and measurements were made of the response of the particles along a normal shock wave using a Laser Anemometer operated in back-scatter. Aluminium oxide powder with 0.3µm size particles was used. As can be seen in figure 1 there is excellent agreement in the results obtained with the two types of seeding devices. 210250290330370410-2 0 2 4 6 8 10Distance from Wedge [mm]Velocity [m/s]Oil MistAlO Pwder 0.3um Fig. 1 Comparison of the response of seeding particles in a normal shock. 10F01 Powder seeder shows excellent agreement with results from an Oil Mist seeder. Aluminium Oxide powder was used of 0.3 microns in size Additional information Please find detailed additional information in the other Product Information sheets located on our web site www.dantecdynamics.com or contact our Dantec representative in your country. Ordering information Model Description 9010F0010 Powder seeder, 10 bar back pressure Dantec Dynamics undertakes a continuous and intensive product development programme to ensure that its instruments perform to the highest technical standards. As a result the specifications in this document are subject to change without notice. Publication No.: pi_130_v8 www.dantecdynamics.com