Increasing the compression ratio of a diesel...

Question 1 / 205eccefa1bacbc34ba4d47359

Question 1 of 205eccefa1bacbc34ba4d47359

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in __________.

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Question 1 of 20

5eccefa1bacbc34ba4d47359

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in __________.

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🔍 Key Concepts

• compression ratio and how it affects peak temperature and pressure in the cylinder • basic diesel cycle / thermal efficiency relationship to compression ratio • what happens to heat losses and cylinder pressure when compression ratio changes

💭 Think About

• If the same amount of fuel is injected but the air is compressed to a higher pressure and temperature before injection, what happens to the combustion temperature and pressure? • How does increasing compression ratio generally affect the efficiency of an ideal diesel (or Otto) cycle? Think in terms of work output vs. heat input. • Would higher compression normally cause more or less heat to be rejected to the exhaust and cooling water, for the same fuel flow?

✅ Before You Answer

• Recall that in a diesel engine, ignition is caused by compression heating the air – what does more compression imply? • Consider whether cylinder peak pressure would be higher or lower with increased compression, all else equal. • Think about whether a higher compression ratio makes the engine convert a greater fraction of fuel energy into work or into waste heat.

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Question 1 of 20

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in __________.

reduced efficiency

increased thermal efficiency

increased heat loss

lower cylinder pressures

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Question 1 / 205eccefa1bacbc34ba4d47359

Question 1 of 205eccefa1bacbc34ba4d47359

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in __________.

Back

Question 1 of 20

5eccefa1bacbc34ba4d47359

Increasing the compression ratio of a diesel engine while maintaining the designed rate of fuel flow will result in __________.

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

👋 Hi! I'm Genie, your AI study assistant. How can I help you with this question?

Quick actions

— No credit card needed