What is the relationship between a flame holder and a cavity flame holder

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In the combustion chamber of a scramjet

In: 1

I wish I could but I can only comment so that this might get the attention of someone that can

A flame holder is essentially a lower flow area that is used to prevent the continuously combustion flame from being blown out. This is essentially what you are doing when you hold your hand between the candle and the wind.

A cavity flame holder is just one way to create an area of low flow to maintain the flame. The cavity flame holder consists of a hollow area below a high flow zone. Most of the air flows over the cavity leaving the cavity as a relatively calm air pocket.

Imagine that I have a square tube through which we pass supersonic air. Now, in the middle of the tube, we knock out a square in the bottom of the tube and weld on a cubical box (the cavity) around the knocked out section. Most of the air will pass over the cavity leaving the cavity relatively calm and allowing the flame to remain lit.

EDIT:

All cavity flame holders are flame holders. Not all flame holders are cavity flame holders.

A flame holder is a device that helps to support and maintain a flame in an environment where there is combustion. A cavity flame holder is a type of flame holder that uses the geometry of the combustion chamber to help keep the flame stable.

A flame holder is a device that helps to keep a flame burning by providing an oxygen rich environment. A cavity flame holder is a type of flame holder that uses a chamber or space to help keep the flames burning. The chamber provides oxygen to the fire while also keeping it contained so it doesn’t spread.