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Our Blog Feedhttp://crturbos.co.uk/index.php?cID=Our main blog feed
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Job VacancyJanuary 05, 2015 01:10:21 BSThttp://crturbos.co.uk/index.php?cID=286SALES AND TECHNICAL ADVISOR Duties to include: As the Sales and Technical Advisor you will deal with telephone, email and website enquiries, process quotes and give technical advice. Skills required: You should• possess a sound mechanical/automotive/engineering knowledge....• be able to use your own initiative and be confident in your decision making abilities.• have good team working skills.• have excellent communication skills.• have the patience and the ability to deal with people in a professional and approachable manner. In return we can offer you:• salary (negotiable).• basic 39½ hours per week.• varied and interesting work in a successful and progressive company.• a modern and friendly working environment.• 24 days holiday, plus 8 bank holidays. Applicants should email heidi@crturbos.co.uk or call 01425 638426. CVs can be sent to: CR Turbo Engineering, Units 1-4 Millfield, Queensway Industrial Estate, New Milton, Hampshire, BH25 5NN
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Turbocharger DesignFebruary 11, 2012 01:10:21 BSThttp://crturbos.co.uk/index.php?cID=111A turbocharger is basically a combination of a compressor and a turbine, both mounted on a common shaft. Turbocharger uses the exhaust gases of the engine itself, to rotate the turbine which in turn moves the compressor.Mainly two type of compressors are used in a turbocharger. Centrifugal compressors Axial flow compressorsCentrifugal compressors are generally used in applications where the size of turbocharger is to be kept small, for e.g., turbocharger in automotive system.Axial flow compressors are used in applications of larger radial units where internal modifications might be needed. They are most efficient with engines using heavy oils.trubocharger construction Main PartsThere are three main parts of a turbocharger : Turbine Impeller / Compressor Central HubThe wheels of the turbine and compressor are contained in their own conical housing. The amount of air that is to be submitted depends on the sizes of these wheels. The shaft is contained in the central hub with the help of bearings and connects the turbine and impeller wheel on the opposite sides. Due to high speed of rotation, extreme heat is generated in the hub. Water cooling or any other form of cooling system is provided to prevent temperatures from rising.Sufficient sealing arrangements are made between the compressor and turbine side to prevent mixing of gases. A filter is provided on the turbine side to ensure that the air going to the compressor side is free of any impurities. Turbine SideThe turbine side is usually made of cast iron material. The inlet side of the turbine have nozzle blade ring which is used for two purposes - To guide the incoming gas onto the turbine wheel To house the turbine bearingsThe outlet side of the turbine casing consists of blower and air passages to supply air to labyrinths seals.Compressor SideThe compressor side is usually made of aluminum alloys and it also consists of two parts. The inlet part or casing deals with drawing air from the surrounding areas i.e engine room or deck spaces. If air is drawn from the deck spaces, special ducting is made for the same. The advantage of drawing air from the deck spaces is low air temperature and humidity. While the advantage of drawing air from the engine space is that the air is pressurized and there is no need for long and complex ducting arrangements.The main parts on the compressor side are inducer, impeller, diffuser and inlet and outlet casing.TurbochargerWorkingThe turbine uses energy from the exhaust gases to convert heat energy into rotational motion. This rotational motion of turbine drives the compressor, which draws in ambient air from the surrounding and pumps compressed air with high density and pressure into the intake manifold.The exhaust gas enters the turbine inlet side of the turbocharger through a pressurized chamber and a series of filters. The nozzle blade rings concentrates the exhaust gas on to the turbine wheel. The movement of the turbine wheel rotates the shaft which in turn rotates the impellor of the compressor. A part of this air goes to the labyrinths seal from the outlet side of the turbine.As the impeller rotates, air is sucked in through the center of the impeller and due to the heavy rotational movement, experiences circumferential velocity which pushes it outwards. A radial velocity is gained which pushes the air further outwards on to the inducer. An additional resultant velocity is gained due to the accurately designed inducer inlet angle which gives maximum compressor efficiency.Excessive pressure leads to spoiling or fouling of the impeller and inducer surfaces. This results in change in angle of incidence and thus drop in efficiency.All heavy fuel engines are subjected to heavy load variations which results in fluctuation of exhaust. gas pressure. A prolonged fluctuation in pressure leads to detrimental effects on the internal parts of the compressor. For this reason, constant pressure chambers are provided in most of the engines. The exhaust gas , instead of directly entering from the engine, first goes to the pressure chamber and from there it is circulated to the turbine at constant pressure. This reduces the excessive stress that gets created on the shaft bearing and sealing. We will learn about turbocharger surging in our next article.compressor section turbocharger ReferencesIntroduction To Marine Engineering - 2nd Edition by D.A TaylorImage Creditshttp://www.lotusespritturbo.com/Garrett_AiResearch_T3_Turbocharger.jpghttp://www.paxmanhistory.org.uk/images/turbochr.gifhttp://upload.wikimedia.org/wikipedia/commons/7/76/Turbocharger.jpg
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A Hallmark Throughout Turbo HistoryFebruary 11, 2012 01:10:21 BSThttp://crturbos.co.uk/index.php?cID=110When Caterpillar needed a turbocharger developed for its D9 tractor in 1950, it didnandrsquo;t call an automotive supplier. Instead it called an aerospace company andmdash; Garrett Corporation, whose successful development of turbochargers led to the formation of AiResearch Industrial Division, which later became part of Honeywell.Known at the time for producing gas turbine engines and cabin pressurization systems, Garrett had well-developed expertise in turbo-machinery and aerodynamics: areas that would prove essential in developing a mainstream turbocharger application.Following the first phase of the Caterpillar project, Garrett turbochargers saw ever wider use on earth-moving equipment, in tractors, stationary powerplants, railroad locomatives and ships. The Garrett T11 automotive turbocharger came into being in 1960 and promtly became popular with diesel truck operators.By 1962, Garrett was powering the worldandrsquo;s first turbocharger production car, the Oldsmobile Jetfire Rocket. This was followed by several other firsts, including the first turbocharged car to win the Indianapolis 500 (1968), the first turbo for a non sports car application (1977-Saab 99), the first mass production turbo fo