Assuming the use of ultra low sulfur content diesel fuel, what combination of arrangements associated with river push boat main engine configurations would result in the most accelerated corrosion of the inside wall of an exhaust manifold of a main propulsion diesel engine?
⢠Effect of exhaust gas temperature on condensation and corrosion inside manifolds ⢠Differences in two-stroke vs. four-stroke exhaust flow and temperature patterns ⢠How water-jacketing (cooled) vs. uncooled manifolds affects metal temperature and moisture condensation
⢠For corrosion to be accelerated, what combination of gas temperature and metal surface temperature will cause the most condensation of acidic moisture on the metal? ⢠Between two-stroke and four-stroke engines, which tends to have hotter, more continuous exhaust flow, and which might allow more cooling and condensation in the manifold? ⢠How does adding a water jacket around the manifold change the inner wall temperature and the likelihood of moisture condensing there?
⢠Identify which setup would keep the manifold wall coolest while still exposing it to combustion products that can form acids ⢠Decide whether cooled (water-jacketed) or uncooled manifolds are more likely to stay below the dew point of water/acid vapors in the exhaust ⢠Compare how often and how strongly exhaust pulses hit the manifold in two-stroke vs. four-stroke operation and how that impacts heating vs. cooling of the metal
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