Ejector Chamber Research Articles

Mobile pneumatic transporter for snow and garbage removal from roofs and house areas

Snow removal from roofs and near-house territories is relevant for the Perm Territory in the winter. The article discusses a mobile pneumatic transporter for garbage and snow removal consisting of a fan, a loading bin, an ejector chamber, and a vibrator. The main novelty of the plant is the use of polyethylene film for transport ducts. Air ducts were made by soldering with a hot iron. In the suture allowances, sutures were made to hang air ducts on a cable when removing snow from the roof. The calculation of the ejection funnel for the fan FS-2101/SP 220D is given in the work. As the funnel body, a plumbing two-rib tee with a diameter of 150 mm was used, in which a confuser of Æ100 mm was made. Since there is no data in the literature on the coefficient of friction of polyethylene, measurements of the total pressure losses in the system from the funnel to the final point of unloading, the dependence of the air flow rate and the suction rate from the loading hopper were made on the forty-meter air duct. After the calculations, a mixing chamber with a diameter of 125 mm was added to the tee. The pneumatic transporter demonstrated the ability to move snow to a distance of 40 meters at a speed of 10 m/s. Snow capacity is 9 cubic meters per hour. When removing snow from the roof along the air duct suspended with a slope of 1: 4, the snow can slide without the fan turned on. The pneumatic transporter can be used as a loader to a height of at least 4 m. The advantage of our pneumatic transporter over snowplows is the electric fan drive. This allows you to store the installation in the utility rooms of a residential building, without violating fire safety. The film ducts are compactly folded into a storage roll.

Investigation of the shear-zone length in fine hydromechanical blanking

A new process called fine hydromechanical blanking is proposed in this paper. In contrast to conventional fine blanking, in fine hydromechanical blanking, the V-ring indenter on the guide plate is replaced by a V-ring cavity formed in a workpiece and pressurized by hydraulic pressure. In addition, the counterforce from the blanking ejector is replaced by the hydraulic pressure acting on the ejector chamber. An experimental algorithm for optimization based on the Taguchi method, in which a genetic algorithm is used for searching, is proposed to determine the largest shear-zone length. From the experimental results, it is concluded that the proposed method can achieve the same effects as conventional fine blanking. In addition, an investigation of the effect of the hydraulic pressure in the V-ring cavity and ejector chamber on the shear-zone length was conducted through a series of experiments. The results show that the experiments were greatly affected by the height of the burnished surface and indicate the significance of the hydraulic pressure in the V-ring cavity and ejector chamber.

Influence of resonators on the acoustic and propulsion performance characteristics of a ramjet ejector chamber under conditions with vibration hydrogen combustion

The influence of acoustic resonators on the acoustic and propulsion performance characteristics of a ramjet ejector chamber under conditions with vibration hydrogen combustion was experimentally examined. In the study, resonators having identical throats and different cavity diameters were used. For fixed-volume resonators the best propulsion performance characteristics were achieved in the case in which the cavity diameter differed little from the resonator throat diameter.