air injection definition
air embolism. n. 1. (Medicine) the presence in the tissues and blood of a gas, such as air or nitrogen bubbles, caused by an injection of air or, in the case of nitrogen, by an abrupt and substantial reduction in the ambient pressure. See decompression sickness. From Wikipedia, the free encyclopedia. Secondary air injection (commonly known as air injection, or colloquially smog pump or pollution pump) is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller combustion of exhaust gases. Contents. In all cases, pH of syrup made with or with-out air injection was within the established range of pure maple syrup. Conductivity The conductivity of maple syrup produced with air injection is not significantly differ-ent from that produced without air injection. Air injection can also be achieved by taking advantage of the negative pressure pulses in the exhaust system at engine idle. A sensitive reed valve assembly called the aspirator valve is placed in the air injection plumbing, which draws its air directly from the clean side of the air filter. Noun. 1. air embolism-obstruction of the circulatory system caused by an air bubble as, e.g., accidentally during surgery or hypodermic injection or as a complication from scuba diving. aeroembolism, gas embolism. embolism-occlusion of a blood vessel by an embolus (a loose clot or air bubble or other particle). In the laboratory scale study, parameters such as the total soluble phenolic acid con-. tent, total antioxydant activity and oxydo-reduction potential were used to assess the. impact of air injection on the bioactive properties of maple syrup. The current research was meant to investigate the effect of this technology. on maple syrups physical and sensory attributes and to see if air injection contravenes. Quebec's provincial regulation forbidding the use of decoloring, bleaching or refining. processes. Phenolic Compounds In a laboratory-level study, syrup made with air injection had significantly lower lev-els of syringaldehyde than syrup made without air injection. A tendency for higher levelof vanillin with the use of air injection was observed, although the results were not sta-tistically different. Rather than being a primary emission control device, the secondary air injection system was adapted to support the efficient function of the catalytic converter. The original air injection point became known as the upstream injection point. Pumped air injection systems use a vane pump turned by the engine via a belt or electric motor. The pump's air intake is filtered by a screen to exclude dirt particles large enough to damage the system. Air is delivered under pressure to the injection point(s).
It is a vehicle emissions control strategy introduced in 1966, wherein fresh air is injected into the exhaust stream to allow for a fuller combustion of exhaust gases.