{"id":2484,"date":"2024-08-03T13:28:14","date_gmt":"2024-08-03T13:28:14","guid":{"rendered":"https:\/\/svestudy.com\/?page_id=2484"},"modified":"2025-05-12T19:21:08","modified_gmt":"2025-05-12T19:21:08","slug":"mde-unit-4-q6","status":"publish","type":"page","link":"https:\/\/svestudy.com\/?page_id=2484","title":{"rendered":"MDE Unit 4 Q6"},"content":{"rendered":"\n
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Quiz<\/a><\/p>\n<\/div>\n\n\n\n

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Next Unit<\/a><\/p>\n<\/div>\n<\/div>\n\n\n\n

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With reference to large medium speed diesel engine turbo chargers:
(a) explain what is meant by the term pulse system;(6)
(b) explain the advantage the pulse system has over the constant pressure system.(4)<\/p>\n\n\n

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Pulse System in Large Medium Speed Diesel Engines<\/p>\n\t\t\t

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A pulse system in a large medium-speed diesel engine turbocharger refers to a method of utilizing the pressure waves generated by the exhaust gases to drive the turbine.<\/strong><\/p>\n\n\n\n

How it works:<\/h3>\n\n\n\n
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  • Exhaust pulses:<\/strong> The exhaust gases from each cylinder are discharged into the exhaust manifold in discrete pulses.<\/li>\n\n\n\n
  • Manifold design:<\/strong> The exhaust manifold is designed to optimize the timing and strength of these pressure waves.<\/li>\n\n\n\n
  • Turbine inlet:<\/strong> The turbine inlet is connected to the exhaust manifold in a way that maximizes the impact of the pressure waves on the turbine blades.<\/li>\n<\/ul>\n\n\n\n

    Advantages of pulse system:<\/h3>\n\n\n\n
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    • Improved turbocharger response:<\/strong> The pulse system can provide quicker turbocharger spool-up due to the direct energy input from the exhaust pulses.<\/li>\n\n\n\n
    • Increased turbocharger efficiency:<\/strong> By effectively utilizing the energy in the exhaust pulses, overall turbocharger efficiency can be improved.<\/li>\n\n\n\n
    • Reduced turbo lag:<\/strong> The pulse system helps to minimize the delay in turbocharger response, enhancing engine performance.<\/li>\n<\/ul>\n\n\n\n

      It’s important to note that while pulse systems offer advantages, they can also introduce challenges such as backpressure and interference between exhaust pulses.<\/strong><\/p>\n\n<\/div>\n\t\t<\/div>\n\n

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      Disadvantages of Pulse Turbocharging Systems<\/p>\n\t\t\t

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      While pulse turbocharging offers advantages in terms of turbocharger response and efficiency, it also presents certain challenges:<\/p>\n\n\n\n

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      • Inefficient Turbine Operation:<\/strong> At low engine speeds or under light load conditions, the exhaust gas pulses may not be sufficient to effectively drive the turbine, leading to reduced efficiency.<\/li>\n\n\n\n
      • Exhaust Gas Interference:<\/strong> The overlapping exhaust pulses from different cylinders can interfere with each other, reducing the effectiveness of the turbine.<\/li>\n\n\n\n
      • Complex Exhaust Manifold Design:<\/strong> Pulse systems require intricate exhaust manifold designs to optimize the timing and strength of the exhaust pulses, increasing manufacturing costs and complexity.<\/li>\n\n\n\n
      • Backpressure:<\/strong> Pulse systems can generate higher backpressure compared to constant pressure systems, which can negatively impact engine performance.<\/li>\n\n\n\n
      • Noise:<\/strong> The pulsating nature of the exhaust gases can lead to increased noise levels.<\/li>\n<\/ul>\n\n\n\n

        Due to these challenges, pulse turbocharging systems are often used in combination with other turbocharging technologies or replaced by constant pressure systems in certain engine applications.<\/p>\n\n<\/div>\n\t\t<\/div>\n<\/div>","protected":false},"excerpt":{"rendered":"

        Quiz Next Unit With reference to large medium speed diesel engine turbo chargers:(a) explain what is meant by the term pulse system;(6)(b) explain the advantage the pulse system has over the constant pressure system.(4)<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":0,"menu_order":0,"comment_status":"open","ping_status":"closed","template":"templates\/template-full-width.php","meta":{"nf_dc_page":"","footnotes":""},"class_list":["post-2484","page","type-page","status-publish","hentry"],"featured_image_src":null,"_links":{"self":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2484","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages"}],"about":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/types\/page"}],"author":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fcomments&post=2484"}],"version-history":[{"count":4,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2484\/revisions"}],"predecessor-version":[{"id":9571,"href":"https:\/\/svestudy.com\/index.php?rest_route=\/wp\/v2\/pages\/2484\/revisions\/9571"}],"wp:attachment":[{"href":"https:\/\/svestudy.com\/index.php?rest_route=%2Fwp%2Fv2%2Fmedia&parent=2484"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}