In order to study the influence of acceleration on the internal ballistic performance of solid rocket motors, the combustion experiment must be performed in a set acceleration field environment. During the experiment, the frequency converter is first operated to make the transmission shaft of the test stand reach the set rotation speed and provide the required acceleration field. In order to scientifically analyze and compare the experimental results, it is required to use the same tablet-type charge engine and keep the loading parameters constant, that is, the size and shape of the charge, the nozzle material and throat diameter, the structure of the igniter, and the amount of charge. No change. The engine is mounted on the interface part and its position must fully satisfy the condition that the acceleration vector is perpendicular to the charge burning surface. The influence of acceleration on the interior ballistic performance of solid rocket motors: The performance of solid rocket motors changed significantly under acceleration conditions. The average combustion chamber pressure p increased by 36% and the burning time t decreased by 20%. Other parameters also changed somewhat. There are many reasons for this change, but the dominant one is the acceleration sensitivity of aluminum-containing composite propellants, and the core problem is the acceleration sensitivity of propellant burning rate. The change of burning rate is the decisive factor in the change of the ballistic performance of solid rocket motors. There are many factors that affect the burning rate change, such as aluminum powder content, particle size and shape; oxidant content, particle size and grading ratio; static burning rate value; acceleration and the azimuth of its vector-directed burning surface;combustion chamber pressure; combustion Indoor flow field and nozzle flow field. To analyze this problem scientifically, three tools are needed: the pocket model, the particle dynamics model and the combustion model model are related to each other. The pocket model is the premise, which explains the influence of AP on the agglomeration and combustion process of aluminum particles. . The particle dynamics model is the basis of the analysis. It is a study of the conditions required to agglomerate the force of the aluminum particles and the conditions for the particles to fly away or remain in the fuel surface under the acceleration field. The combustion model is to discuss the thermodynamic process after particles stay on the burning surface.
Car Care Kit mainly refers to the cleaning, beauty and maintenance of the car products used in the car. Car washing and care involves all aspects of the car interior, such as car sunscreen film, car gloves, car floor mats, car anti-skid pads, seat cushions, and so on. Car supplies can beautify the environment and contribute to your health.
A car care kit typically includes a variety of products and tools designed to help keep a car looking and running its best. Some common items that may be included in a car care kit include: Car Care Kit,Car Headlight Restoration Kit,Car Cleaning Kit Car Shine,Car Cleaner Kit Jiangyin yinghuameng Houseware Co.,Ltd. , https://www.yhmcarcare.com
1. Car Wash soap: A specially formulated soap that is designed to clean a car's exterior without damaging the paint or clear coat.
2. Microfiber towels: Soft, absorbent towels that are perfect for drying a car after washing or wiping down the interior.
3. Tire cleaner: A spray or foam cleaner that is designed to remove dirt and grime from tires, leaving them looking shiny and new.
4. Wheel cleaner: A specialized cleaner that is designed to remove brake dust and other grime from wheels, leaving them looking clean and shiny.
5. Glass Cleaner: A spray or foam cleaner that is designed to clean windows and mirrors without leaving streaks or residue.
6. Interior cleaner: A cleaner that is designed to remove dirt, stains, and other debris from the interior of a car, including seats, carpets, and dashboard.
7. Wax or sealant: A protective coating that is applied to a car's exterior to help protect the paint from UV rays, dirt, and other environmental factors.
8. Applicator pads: Soft, sponge-like pads that are used to apply wax or other products to a car's exterior.
9. Detailing brushes: Small brushes that are designed to help clean hard-to-reach areas, such as around the edges of wheels or in tight spaces on the dashboard.
10. Air freshener: A spray or hanging air freshener that is designed to keep the car smelling fresh and clean.