A set of aerodynamic characteristics of norway spruce (Picea Arbies L.) seeds
Paweł Tylek , Zdzisław Kaliniewicz , Tomasz Zagrobelny
AbstractThe seed separation is one of the methods to increase the sowing value of seeds. Frequently, due to numerous advantages, the differences in aerodynamic characteristics are used in seed separation. A set of aerodynamic characteristics includes the critical velocity coefficient of resistance, and coefficient of flying. Knowledge is also required of the construction components (filters, pneumatic channels, etc.) of machinery and devices for seed material purification as well as efficient use of cleaners and mechanical sorting machines and other machines for seed treatment. The results of measurements of these parameters for seeds of Norway spruce (Picea abies L.) are presented in this paper. The determination of some characteristics called modifications of known and yet in perfect methods of measurement, and sometimes even designing original measuring stations. In the event of using filming methods that task necessitated developing algorithms for computerised image processing. The division of seeds into two classes, depending on the degree of embryo development (determined by the X-ray method) was taken into account. Measurements of critical velocity were carried out in the vertical aerodynamic tunnel of variable internal area, equipped with a tunnel thermo-anemometer, and cooperating with a video-computer set. In order to calculate the aerodynamic coefficients it was necessary to determine additional physical properties of seeds, i.e. mass and lifting surfaces. The results are presented in the form of tables and histograms. Before undertaking the pneumatic separation, it is necessary to do the size calibration which would standardize the lifting surfaces. Having this done, the separation of individual even seed batches is carried out, and proper fractions are joined.
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