SprayMaster Spray Imaging Systems for Quantitative Spray Analysis

Planar measurements are performed on (laser) light sheets with excellent spatial and temporal resolution. The unique combination of different laser imaging techniques allows multi-parameter measurements with nearly the same system setup. SprayMaster is a complete family of imaging systems for state-of-the-art spray characterization. The innovative measurement techniques applied in the SprayMaster systems provide new insights into even complex spray processes and permit cost effective and efficient development of smarter spray systems. SprayMaster systems are easy to operate, fast and efficient...

Processes & Quantities The major task of a spraying application is the conversion of a liquid fluid into fine droplets having a designated size range and distribution. The processes involved are the breakup of the liquid structures into droplets followed by further atomization into smaller droplets. Eventually the fluid may evaporate and mix with the surrounding gas. This complex multi-stage spray formation process has to be optimized for each desired application. For example, for coating, painting and wetting processes the interaction of the spray with a surface is important, while in combustion...

Spray Characterization Spray Imaging Overview 4multi-phase flow fields 4mass flux 4planar droplet sizing 4Sauter Mean Diameter D32 4liquid/vapor phases 4liquid temperature 4with LIF tracers 4local drop size 4drop velocity 4mass transfer 4for dense sprays 4mass distribution 4Mie or LIF Spray propagation: High Speed imaging at several kHz

LaVision‘s SprayMaster systems enable the user to measure accurate and precise spray data from nearly all types of sprays including continuous sprays, periodic pulsed or transient sprays. Its inspex versions based on backlights or light sheets are designed for routine measurements of spray geometry and patternation. A customized Graphical User Interface (GUI) supporting remote system control is a favorable feature for quality control applications. SprayMaster systems using laser sheet imaging measure instantaneous liquid (vapor) spray mass distributions and planar droplet size (D32) maps as well...

Contactless optical spray quality control The SprayMaster inspex is a cost effective way of quantitatively measuring the spray pattern in very short measurement times with high reproducibility. It is the ideal testing tool for personal care, beauty & fragrance products, home care and similar sprays. The number of tested samples per day can be significantly increased by a highly integrated measurement and data generation procedure. The prealigned setup for a widely adjustable measurement plane reduces setup and product change time to a minimum. All types of aerosol, non-aerosol and powder sprays,...

Quality Control SprayMaster inspex components Optical spray pattern analysis The SprayMaster inspex system makes use of flexible optical light guides. The light source is located outside the spray region or testing compartment. This removes any electrical parts of the illumination from the spray. The contactless radial cut of a spray replaces the conventional testing paper or mechanical patternation by a thin sheet of light. The camera captures the intersection of a light sheet with the spray plume at a defined plane and immediately generates a spray pattern image from it. 4eye-safe illumination...

SprayMaster inspex for fuel sprays The SprayMaster inspex is designed as a universal and easily applicable tool for the measurement of fuel spray geometry. Spray cone size, shape and evolution is directly imaged either with standard or slow-motion cameras. A fast optical shutter or strobe light illumination freeze any motion and reveals crisp still standing images from any stage of the spray plume development. The system can be universally applied to all types of fuel sprays, like Diesel, port fuel or direct injection gasoline, or gas turbine injector sprays. Spray test chambers can be equipped...

Fuel Sprays Axial spray cuts: plume geometry and propagation Axial cuts are aligned with the spray propagation direction. Measurements are achieved using light sheets, global lighting or backlighting. Spray cone angles are measured directly from images using one of these methods: 4at a given distance from the orifice (single or multiple planes) 4by interpolation of the spray rim 4by integration of the spray plume 4bend angle (deviation from orifice axis) and both half angles indi- cate the symmetry and direction of the spray plume Additional measures are: 4tip penetration represents the propagation...

Laser Imaging in Sprays Droplet Sizing Systems Based on imaging shadow projections of droplets the method of Shadowgraphy is applied in a small volume at a desired position within a spray (local). Quantitative absolute results are obtained and a range of lightsources from pulsed LEDs to lasers can be used as backlight source. A long distance microscope assures a safe working distance at a high magnification to even detect very small droplets. ParticleMaster Shadow 4droplet size and velocity incl. correlations 4drop shape (eccentricity) 4statistics, histograms (D10, D32, DV50) Detected droplets...

Laser Imaging in Sprays The Laser Induced Fluorescence (LIF) signal is proportional to the droplet mass and, therefore, contains a different information from what can be observed with purely Mie scattered light, which is proportional to the surface of the droplet. In combination with PIV the mass flux can be derived. Liquid mass distribution Laser Induced Exciplex Fluorescence (LIEF) allows simultaneous visualization of the two phases. Due to the special LIF tracers the signals from the liquid and the vapor phase can be spectrally separated by optical filters. Liquid phase Vapor phase Velocity...

Laser Imaging in Fuel Sprays In-cylinder spray imaging Max Fuel Concentration Time Development Fuel sprays determine to a large extend the fuel/air mixing process in e. g. ICengines and gas turbines and, thus, the quality of the combustion process itself. Laser imaging provides useful information about the fuel concentration distribution, evaporation and, finally, maps of fuel/air mixture ratios. Exciplex Fluorescence liquid phase vapor phase Vaporizing fuel spray Laser spray imaging offers an efficient analytical method for spray characterization replacing old “trial and error” approaches and...