Is reciprocating engine a combustion generator?
An opposed-piston engine is a reciprocating internal combustion engine in which each cylinder has a piston at both ends, and no cylinder head.Whereas the radial engine is a reciprocating type internal combustion engine configuration in which the cylinders point outward from a central crankshaft like the spokes on a wheel.
An internal combustion engine is an engine where the fuel combustion happens inside a combustion chamber. There are both Reciprocating and Rotary engines that fall into this category. Most cars on the road today use internal combustion engines. An example would be the V-8 Hemi engines that Dodge puts in their trucks.
How you can now if the engine is internal combustion or external combustion while it is not working?
By looking at the build of it. If it's a gas turbine, jet engine, ramjet, or rocket motor, then it's not internal combustion. If it uses pistons in enclosed cylinders, then the combustion occurs internally, within the engine housing. Hence, that would be an internal combustion motor. a reciprocating steam engine is external combustion even though it has enclosed cylinders
Type of combustion is determined by the engine, not the fuel. Intermittent or reciprocating engines such as those found in cars and trucks can run on diesel. Gas turbines AKA jet engines can also run on diesel however they are continuous combustion engines. The answer to your question depends on the type of engine you have in mind. If it has pistons then it will be intermittent.