🔍 Key Concepts

• Scavenging flow patterns inside a 2‑stroke diesel cylinder (how fresh air and exhaust gas move) • Difference between cross flow, loop, and uniflow scavenging arrangements • Location of intake ports vs. exhaust outlet in each scavenging type

💭 Think About

• Look at where the fresh air enters the cylinder in the illustration and where the exhaust leaves. Does the gas path change direction or stay mostly in one direction? • Ask yourself: Does this design need a deflector piston crown to turn the flow, or does the port/valve arrangement itself control the gas movement? • Compare the drawing to the typical textbook sketches of the three main scavenging types and see which overall flow pattern (across, looping, or straight-through) this most closely matches.

✅ Before You Answer

• Verify whether the exhaust outlet is at the top or the side of the cylinder in the figure. • Check if the scavenge ports are all around the lower cylinder liner and angle the flow in a particular direction. • Confirm whether the gas path is essentially straight from one end of the cylinder to the other or if it must turn sharply to exit.