In addition to measuring the true north direction, a compass or compass can also measure the specific direction of the target. The method is to aim the collimator at the target on the Cairo disk, or aim the 0 scale on the dial at the target, so that the target, the 0 scale and the magnetic midpoint are on the same line. After the compass is horizontally stationary, the scale pointed by the N end is the direction from the measuring point to the target. For example, the n end of the magnetic needle points to 36.
Optimal characteristics of SEN nozzle:
The optimization of sensing structure is mainly realized by optimizing its exit angle, bottom shape, exit area and shape. Under the normal casting speed, the outlet angle and bottom shape of the nozzle are optimized.
The circular outlet nozzle with nozzle inclination of 25, flat bottom and diameter of 40mm is most beneficial to reduce the possibility of longitudinal crack and slag inclusion on the slab surface. At high casting speed, the top and bottom angle is 65438+05, and the concave bottom nozzle has the best effect.
Velocity distribution of elliptical, rectangular and square nozzles at low casting speed and high casting speed, in which the left and right nozzles are established in the same coordinate system.
Because the test is point measurement and the actual boundary conditions are not clear, the velocity distribution diagram can only show the velocity distribution in the center of the measuring point.
Under two kinds of casting speeds, the uniformity of outlet velocity distribution at the same side of the nozzle is elliptical.