Oil tank for a turbomachine with negative-G-compatible cyclonic circulation

An oil tank for an aircraft turbomachine, comprising:

• a main enclosure configured to contain oil;
• an oil inlet mixed with air, arranged on the main enclosure;
• an oil outlet for connection to a lubrication circuit;
• an auxiliary enclosure comprising an enclosing wall, and two end walls adjacent to said enclosing wall, at least one of the two end walls comprising at least one oil passage with an interior of the main enclosure,
• at least one auxiliary inlet opening tangentially to the enclosing wall and passing through the auxiliary enclosure for connection to an auxiliary circuit;
• and
• an auxiliary outlet opening tangentially to a larger diameter section of the enclosing wall compared to that of the auxiliary inlet, said auxiliary outlet passing through the auxiliary enclosure for connection to the auxiliary circuit, the oil outlet being arranged on the auxiliary enclosure or on the main enclosure.