How Do Tank Engines Start in Freezing Temperatures shorts

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How Do Tank Engines Start in Freezing Temperatures? • Starting a tank's engine in cold weather can be tough due to the thickened oil and the possibility of a weak battery. This is where the spinning flywheel comes to the rescue. The flywheel is a heavy, circular disc securely mounted on the engine's crankshaft, designed to store rotational energy. It connects to the engine by a clutch and can spin freely even when the engine is off. • When it’s hard to generate the initial force required to start the engine, flywheel's stored energy becomes invaluable. It provides a burst of rotational energy, helping to overcome the resistance caused by cold, thickened oil. As the flywheel transfers its stored energy to the engine, it initiates the turning of the crankshaft, kickstarting the engine. Once it's up and running, the process becomes self-sustaining. • Soon the engine generates heat, warming up the oil, and the tank is ready to roll. • In some modern tanks, like the A1 Abrams, an auxiliary power unit (APU) has been designed to replace the conventional mechanical flywheel, making cold starts even more efficient. • #tank #coldstart #freezing • • Note: The appearance of U.S. Department of Defense (DoD) visual information does not imply or constitute DoD endorsement. • • ADDITIONAL READINGS: • A cold start is an attempt to start a vehicle's engine when it is cold, relative to its normal operating temperature. A cold start situation is when coolant, oil and water are in still position minimum 90 minutes before the start. Cold start does not refer to cold climate and outside temperature. It is called cold start because of oil and water lack in system before the start, and because of that it's harder to start the engine. Therefore, there's higher sound from the engine and exhaust at the cold start. • • Cadillac Eldorado cold start • Diesel engines have more difficulty starting at low outside temperatures than gasoline engines. That is because diesel is a thicker fuel than gasoline and contains more oil than petrol. Due to low outside temperatures, the diesel becomes thicker and therefore burns less efficient. • Causes of cold starts • Cold starts are more difficult than starting a vehicle that has been run recently (typically between 90 minutes and 2 hours). More effort is needed to turn over a cold engine for multiple reasons: • The engine compression is higher as the lack of heat makes ignition more difficult • Low temperatures cause engine oil to become more viscous, making it more difficult to circulate the oil. • Air becomes more dense the cooler it is. This affects the air-fuel ratio, which in turn affects the flammability of the mixture. • Fuel becomes thicker because the oil in the fuel is thicker at low temperatures (most common in diesel engines). • Solutions to cold starting • The problem of cold starting has been greatly reduced since the introduction of engine starters, which are now commonplace on all modern vehicles. The higher revs that can be achieved using electric starter motors improves the chance of successful ignition. • Starting fluid, a volatile liquid, is sometimes sprayed into the combustion chamber of an engine to assist the starting procedure. • Diesel engines make use of glow plugs to heat the combustion chamber prior to ignition, improving the conditions inside the engine, while certain manufacturers have incorporated a block heater, which heats the engine block prior to ignition to reduce the problem of cold starting. • Flywheel • A flywheel is a mechanical device which uses the conservation of angular momentum to store rotational energy; a form of kinetic energy proportional to the product of its moment of inertia and the square of its rotational speed. In particular, assuming the flywheel's moment of inertia is constant (i.e., a flywheel with fixed mass and second moment of area revolving about some fixed axis) then the stored (rotational) energy is directly associated with the square of its rotational speed. • Since a flywheel serves to store mechanical energy for later use, it is natural to consider it as a kinetic energy analogue of an electrical inductor. Once suitably abstracted, this shared principle of energy storage is described in the generalized concept of an accumulator. As with other types of accumulators, a flywheel inherently smooths sufficiently small deviations in the power output of a system, thereby effectively playing the role of a low-pass filter with respect to the mechanical velocity (angular, or otherwise) of the system. More precisely, a flywheel's stored energy will donate a surge in power output upon a drop in power input and will conversely absorb any excess power input (system-generated power) in the form of rotational energy.

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