Tech world

The Diesel Engine is known for more power and better efficiency. Now the reasons why the diesel engine produces more torque are listed below. Compression Ratio: In both the engines when the piston moves towards the T.D.C, The Piston of the Diesel Engine compresses the air further more than its T.D.C. This is because in the diesel engine for instant combustion of the fuel heat of the air is required. Thus it raises the temperature above its self-ignition temperature for self-combustion. While in a Gasoline engine we do not require the air to be compressed more as a spark plug is used to ignite the fuel-air mixture and combustion to take place. The following graph will show the efficiency of the Diesel Engine is more  with respect to compression ratio: Faster Combustion: As we know in a gasoline engine the spark plug ignites and the flame travels till it burns all the air-fuel inside the cylinder whereas, in a diesel engine, complete combustion occurs as s...

    How do trains turn without          differential? This is a question that would baffle many. It surely baffled us and we thought the flanges on the wheels keep the trains on the track, but that’s not the case at all. Then what could it be? Let’s try to address that exactly. If you notice the shape of the wheel of a train, you will notice that they are conical in shape. The side with greater diameter is on the inside. The shorter diameter lies towards outside.When the train approaches a curve and has to turn then the wheels slide away in the correct direction. This keeps the train on the track and allows for proper negotiation of the curve.      In studying this theory we are considering that the train is moving in the left direction.Now if the train is making a left turn. Then the wheels due to centrifugal force will move towards the right. Obviously, this will result in an increase in diameter of the right w...

SpaceX falcon Multi-stage space rockets are a bittersweet affair: One minute, they’re sitting on the launch pad, shiny, expensive, and awaiting an explosion-fueled climb. They next, they’re dropping back to Earth in pieces, unceremoniously plopping in the ocean, and sent off to the scrap heap for good. Not anymore. In March, SpaceX launched a “used” Falcon 9 first stage, an unprecedented achievement in spaceflight. It was a milestone for the company, which designed the Falcon’s first stage to land upright—and intact—back on Earth after every launch. Perhaps more importantly, it proved SpaceX’s concept valid. Rockets cost tens of millions or even hundreds of millions of dollars to build. Being able to reuse them could significantly reduce the cost of spaceflight. That may pave the way for all manner of aerospace innovations.

Use of CFD analysis in heat exchanger A wide range of applications such as shell tube heat exchangers, steam pipes in power plants electronic cooling and cooler pipes in nuclear reactor use natural convection as the conventional method for cooling. Natural convection is highly attractive when compared with forced convection since it does not require any extra components, thus offering high reliability and low design and maintenance cost. Conversely, the main challenge in natural convection is free convection from a single heated horizontal cylinder submerged in a liquid with a free surface. The crucial operational parameters that influence the presence and motion of plumes mainly include the Prandtl number, Rayleigh number, submersion depth of the cylinder below the vertically confining surface and magnitude of horizontal confinement. Even though the most recent particle-image velocimetry measurements have uncovered the effect of plume motion on the boundary layer, plume for...

The engine with proposed improvements is capable of doubling the engine output power and of holding it up for a certain period (time depends on a type of the engine) without overheating. This feature allows increasing the vehicle power-to-weight ratio when it is necessary in accordance with the changing vehicle operation and road conditions. Eligible areas of activity for the proposed innovations are: (1) combat tank diesel engines, (2) combat vehicle and heavy army truck diesel engines, (3) heavy truck diesel engines, (4) special purpose vehicles diesel engines (emergency vehicles, fire trucks and others), and (5) engines in electrical generator sets. The essence of the innovation is to improve gas exchange during the two-stroke mode of engine operation. Four-stroke gas exchange is performed like in ordinary four-stroke diesel engine. Two-stroke gas exchange is performed through the inlet and exhaust valve unlike scavenging ports in conventional two-stroke diesel engine. ...